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Sakura Koi Water Brush - Water Brush for Watercolor - 9 ml Tank - Medium Brush Tip

4.3 4.3 out of 5 stars 982 ratings
$7.49
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Medium (Pack of 1)
9 Ml
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Purchase options and add-ons

Color 9 Ml
Size Medium (Pack of 1)
Brand SAKURA
Paint Type Watercolor
Bristle Type Flagged Bristle

About this item

  • Premium Watercolor Brush for Art on the Go: This watercolor brush is perfect for students, hobbyists, and artists
  • Create On the Go: This water brush allows you to transport and store water, letting you paint anywhere
  • Capture the Moment: Portable water brush makes it easy to take on hikes for plein-air painting outdoors
  • Versatile Tool: Fine, flexible brush tip makes fine, medium, or bold brush strokes
  • Create Gorgeous Watercolor Art: Any Sakura watercolor brush is high quality and aids your creativity
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Sakura Koi Water Brush - Water Brush for Watercolor - 9 ml Tank - Medium Brush Tip
$7.49
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Winsor & Newton Cotman Watercolor Paint Set, Sketchers' Pocket Set, 12 Half Pans w/ Brush
$16.75
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Sakura Koi Water Brush - Water Brush for Watercolor - 9 ml Tank - Medium Brush Tip

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Product Description

Koi water brush is designed for the easy transportation and storage of water when you're away from home or the studio. The brush separates into two parts a fine, flexible brush tip and a barrel handle with a plug to carry the water. The comfortable grip is great for controlled blending, shading and highlighting. Technical qualities are polypropylene, transparent barrel and nib holder section, nylon fibers for brush tip, for ages 8 years and cap and plug please keep away from small children. 6 rounds brush. Available in medium size. Comes in 9ml barrel tank.

Top Brand: SAKURA

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Customer reviews

4.3 out of 5 stars
4.3 out of 5
982 global ratings

Customers say

Customers like the portability, quality and ease of use of the paint brush. They mention that it's very convenient for traveling, easy to fill and use and that it is an amazing water brush. Customers also appreciate performance, and versatility. However, some customers have mixed opinions on flow, size, and leakage.

AI-generated from the text of customer reviews

88 customers mention70 positive18 negative

Customers like the quality of the paint brush. They say it's well made, and perfect for traveling. They also say the tips stay true for a long time. Customers also mention that it'll last for ages and is practical for small work.

"I like this brand a lot. I have purchased many over the years. Well shaped brushes and good water control!..." Read more

"...I'm also able to get pretty decent line quality with it...." Read more

"Overall, it’s a well made product but I find it difficult to get any consistency in terms of the amount of water released onto the brush...." Read more

"...If you want a water brush that is durable and easy to use with consistent water flow, I recommend the Koi brush in the #6 medium size...." Read more

49 customers mention46 positive3 negative

Customers are satisfied with the performance of the water brush. For example, they mention it works well, serves well in a small travel kit, and gives a nice result. Some say it works great with Derwent Inktense and water color pencils. Overall, most are happy with the quality and value of the product.

"...They're cheap, easy to use, and do their job beautifully!..." Read more

"...this for small little illustrations in my sketchbook and its done its job pretty well..." Read more

"...The brush works well and gives a nice result, and it holds enough water to use for quite a while...." Read more

"...However, it does work really well and it's innovation and usefulness are fun...." Read more

36 customers mention36 positive0 negative

Customers find the paint brush versatile. They say it's a wonderful tool for watercolor painting, and a perfect product for their art. Customers also mention that it'll make painting enjoyable and easy.

"...It came out beautifully! I can't wait to do a regular watercolor in a larger size and then use this for accents...." Read more

"...They're great for watercolor pencils, woodies, inktense or the like. They make outlining of sentiments smooth and quick...." Read more

"This water color brush is terrific, just what I wanted...." Read more

"...up the tiniest bit with the tip of the Koi water brush, and the effect is stunning!! Scared to do more..." Read more

29 customers mention29 positive0 negative

Customers find the paint brush easy to use. They mention it's easy to refill and use, and is more portable than traditional brushes. Customers also say it'll be great for beginners and is easier to control than a long brush. They also say the innovation and usefulness are fun.

"I absolutely love these little water brushes. They're cheap, easy to use, and do their job beautifully!..." Read more

"...If you want a water brush that is durable and easy to use with consistent water flow, I recommend the Koi brush in the #6 medium size...." Read more

"...However, it does work really well and it's innovation and usefulness are fun...." Read more

"...playing around with it and was amazed at how much more portable and convenient it made a set of traveling watercolors...." Read more

29 customers mention29 positive0 negative

Customers find the paint brush very convenient for traveling due to its compact and easy-to-carry design. They also say it's great for on the go and teaching children water control.

"...This is great for carrying them in different sized travel paint kits...." Read more

"...by unscrewing the tip from the bottom water holder and makes it ideal for travel. I did have one small issue about the waterbrush, however...." Read more

"...It will definitely be very convenient for traveling, which is a huge plus, and the bristles are smooth with good snap...." Read more

"...It’s lightweight, no leakage, perfect for use with those pencils on the go." Read more

44 customers mention27 positive17 negative

Customers are mixed about the size of the paint brush. Some mention it's very small, easy to use and bring outside, and is a nice size for beginners. However, others say that it'd be better if the water tank was larger and the handle was longer.

"...Also, the nylon tip is small enough to get into corners-such as flower tips and leaves...." Read more

"...It is about half a centimeter too long to fit in the 24 color palette, unfortunately...." Read more

"...The size of it is pretty convenient to carry around and its easy to clean...." Read more

"...Be advised the barrel is short and fat - I like the fatter barrel, and the short size allows it to fit in a tiny watercolor kit." Read more

31 customers mention14 positive17 negative

Customers have mixed opinions about the flow of the paint brush. Some mention that the water flowed great without the modification, while others say that it barely reaches the brush and gives out minimal water flow.

"...I ordered the small size bristles and feel like it distributes a little more water than I prefer. Going to try getting the medium 4 mL instead...." Read more

"...I have purchased many over the years. Well shaped brushes and good water control!..." Read more

"...even the tiniest amount of water to the brush that the water leaks out the the threads...." Read more

"...If you want a water brush that is durable and easy to use with consistent water flow, I recommend the Koi brush in the #6 medium size...." Read more

27 customers mention16 positive11 negative

Customers are mixed about the leakage of the paint brush. Some mention that it doesn't leak, and only releases water when they want it to, while others say that it leaks quite a bit, and the pen leaks around the attachment site.

"...Although the little stoppers seal well, I wish there were a better way to store them when not in use, OR that I could buy extras...." Read more

"...Although my only gripe with this water brush is that it leaks more water than I'd like.. but a simple dab on a paper towel will fix it...." Read more

"...It’s lightweight, no leakage, perfect for use with those pencils on the go." Read more

"...I found it to be a miss because of a few leak issues (during travel none the less) and it's seemingly inconsistent flow when I would try to squeeze..." Read more

Best little water brush I've ever used!
5 Stars
Best little water brush I've ever used!
I absolutely love these little water brushes. They're cheap, easy to use, and do their job beautifully! I like that there is no button or pump mechanism, you just squeeze the barrel and out comes the water. They're great for watercolor pencils, woodies, inktense or the like. They make outlining of sentiments smooth and quick. And they don't cost a fortune per brush. All in all very happy and eager to continue using these brushes.
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Top reviews from the United States

njreviewer
5.0 out of 5 stars Good Brand!
Reviewed in the United States on April 9, 2024
Size: Small (Pack of 1)Color: ClearVerified Purchase
I like this brand a lot. I have purchased many over the years. Well shaped brushes and good water control! I appreciate that the different barrel (tank) sizes can be swapped with the different brush sizes. This is great for carrying them in different sized travel paint kits. Although the little stoppers seal well, I wish there were a better way to store them when not in use, OR that I could buy extras. I always manage to lose some over time. Nice Quality!
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Alice
5.0 out of 5 stars Handy and efficient
Reviewed in the United States on October 23, 2022
Size: 1 Count (Pack of 1)Color: 9 MlVerified Purchase
I did a little drawing with it right away with watercolor pencils. It came out beautifully! I can't wait to do a regular watercolor in a larger size and then use this for accents. This seemed to bring out just the right amount of water.
I can't wait to try it for field paintings. I think it would be great for everyone to have one of these and a basic set of watercolor pencils. If you ever travel or just want color sketches, this is for you. I also love the idea that I don't have to pull out all my supplies now to do a little quick watercolor.
Even though I bought the large size, the synthetic white brush comes to a fine point and lets you do little details.
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contrabandk
4.0 out of 5 stars Fits in the Koi 36 color palette
Reviewed in the United States on February 2, 2024
Size: Small (Pack of 1)Color: ClearVerified Purchase
The small/4mL size fits in the Koi 36 color palette so everything can be self contained. It is about half a centimeter too long to fit in the 24 color palette, unfortunately. I ordered the small size bristles and feel like it distributes a little more water than I prefer. Going to try getting the medium 4 mL instead. Like others have mentioned, it’s right loosey, lefty tighty. I am used to it and think it’s funny.
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Brian B
5.0 out of 5 stars Works better than expected
Reviewed in the United States on September 19, 2023
Size: Medium (Pack of 1)Color: 4 MlVerified Purchase
I picked this up to use with watercolor colored pencils, while sitting on the couch. I didn't expect to be as impressed as I am. The brush offers way more control and ability to handle details than I'd expected. Water control is not supposed to be the strong suit of these type of water brushes, but I feel it's definitely good enough for my purposes.

Two caveats: First, this is the smaller size, so pay attention to the "4 ml" vs "9 ml" in the product description. I didn't, but I like it so much that I just bought a few more of the larger size so I can go longer between refills. Second, the cap isn't righty-tighty, lefty-loosey. You actually tighten it with a counter-clockwise twist and loosen it with a clockwise twist. It takes a bit to get used to, but not a big deal.
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Rae
5.0 out of 5 stars Best little water brush I've ever used!
Reviewed in the United States on April 30, 2024
Size: Small (Pack of 1)Color: 9 MlVerified Purchase
I absolutely love these little water brushes. They're cheap, easy to use, and do their job beautifully! I like that there is no button or pump mechanism, you just squeeze the barrel and out comes the water. They're great for watercolor pencils, woodies, inktense or the like. They make outlining of sentiments smooth and quick. And they don't cost a fortune per brush. All in all very happy and eager to continue using these brushes.
Customer image
Rae
5.0 out of 5 stars Best little water brush I've ever used!
Reviewed in the United States on April 30, 2024
I absolutely love these little water brushes. They're cheap, easy to use, and do their job beautifully! I like that there is no button or pump mechanism, you just squeeze the barrel and out comes the water. They're great for watercolor pencils, woodies, inktense or the like. They make outlining of sentiments smooth and quick. And they don't cost a fortune per brush. All in all very happy and eager to continue using these brushes.
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Linda Childs
5.0 out of 5 stars Just a wonderful, portable water brush
Reviewed in the United States on September 19, 2015
Size: Medium (Pack of 1)Color: 9 MlVerified Purchase
This water color brush is terrific, just what I wanted. It holds enough water for me to use it easily ( while using my lap desk in my easy chair at night while watching TV) without getting up to refill it. Also, the nylon tip is small enough to get into corners-such as flower tips and leaves. The brush comes apart by unscrewing the tip from the bottom water holder and makes it ideal for travel.
I did have one small issue about the waterbrush, however. The water holder has a plug that you have to remove in order to use it. Since I easily misplace even large items, I just didn't know what to do with this 1/4 inch (about) sized plug. It was fortinuate for me to have ordered a watercolor box in the same order and my solution was an easy one. I placed the plug in the far left well next to the lid and taped over the well with clear tape. Now, when I'm not planning to water color with it for awhile, I can easily remove the clear tape and pop it into the holder. Easy peezy.
4 people found this helpful
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Lunariad
3.0 out of 5 stars I purchased this as an alternate to my Niji water brush that I have used for a few years and love. I thought I'd try a different
Reviewed in the United States on January 26, 2015
Size: 1 Count (Pack of 1)Color: 4 MlVerified Purchase
Well, I purchased this as an alternate to my Niji water brush that I have used for a few years and love. I thought I'd try a different brand. As yet I haven't tried it and I admittedly went with the Sakura brand name given that I use the Micron pens in my art and they have always worked well for me. Out of the package it appears kind of cheaply made and it's rather small, in my opinion. I understand that it is supposed to be a "travel" brush but so is my Niji which is significantly longer and better made.

Pros: I suppose it's as advertised. I haven't tried it out yet and am not currently able to.

Cons: Top is reverse threaded. States "do not lose black cap", which is small and (in my opinion) unnecessary anyway, but there's really no place to keep it. The cap is supposedly for separating the two halves for travel, so that the tank doesn't leak. It just feels poorly made and the cap that's supposed to go on the back of the brush for added length (I guess? Still shorter than my Niji by a lot) doesn't seem to attach all that firmly.

I probably wouldn't purchase this again but I will keep it and try it out. I suspect I'll be more happy with the Niji I own and have used for watercolor for a few years now. I'll also probably buy another Niji next time.
4 people found this helpful
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Anonywhomous
5.0 out of 5 stars This Made Watercolors Fun Again
Reviewed in the United States on April 28, 2014
Size: Medium (Pack of 1)Color: 9 MlVerified Purchase
When I started using my travel watercolor set, I wanted to carry around with me a brush that was easy to maintain (meaning, me not having to bring a small water cup to clean). Then I found this little gem and I couldn't be happier.

The size of it is pretty convenient to carry around and its easy to clean. I mainly use this for small little illustrations in my sketchbook and its done its job pretty well (If I wanted to do more serious watercolor paintings, I'm not sure I would use this brush.. but it still does a great job for my small doodles). It carries a pretty decent amount of water and I'm able to do quite a bit of painting before I need to refill it (if you want an even smaller water brush to carry, there is also a 4-ml water tank). I'm also able to get pretty decent line quality with it. Although my only gripe with this water brush is that it leaks more water than I'd like.. but a simple dab on a paper towel will fix it.

If you're looking for a decent water brush that can be carried on the go, I think this one is a good place to start.
7 people found this helpful
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Top reviews from other countries

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Armando Andres Alvarez
5.0 out of 5 stars Muy útil.
Reviewed in Mexico on September 11, 2023
Size: Small (Pack of 1)Color: 9 MlVerified Purchase
Excelente. Este me encanto la fluidez del agua y como toma los pigmentos de acuarelas. Lo recomiendo totalmente.
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Dalmo Filho
5.0 out of 5 stars funcional
Reviewed in Brazil on July 23, 2023
Size: Small (Pack of 1)Color: ClearVerified Purchase
bom
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karleswil
5.0 out of 5 stars Good product
Reviewed in Canada on July 7, 2023
Size: Small (Pack of 1)Color: 9 MlVerified Purchase
I specifically look for the Koi brush as I know it is a quality product that I can rely on.
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Leidiane Pereira da Silva
5.0 out of 5 stars Muito bom o produto!
Reviewed in Brazil on June 18, 2023
Size: Medium (Pack of 1)Color: 4 MlVerified Purchase
Chegou bem rápido! Excelente para pintura em aquarela.
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Sergio
5.0 out of 5 stars BUENA CALIDAD
Reviewed in Mexico on June 2, 2021
Size: 1 Count (Pack of 1)Color: 9 MlVerified Purchase
Sakura siempre es sinonimo de calidad, estos pinceles son muy buenos sobre todo para pintar al aire libre y no andar cargando agua, no se si los recomendaría para trabajos profesionales ya que para nada se comparan con los de cerda natural ya que al ser sintéticos la carga de agua es muy poca, por eso el botesito con agua, para que tenga un flujo mejor de agua al momento de pintar.
Si no te quieres gastar tus pinceleles buenos y quieres seguir practicando o quieres aprender acuarela, los recomiendo mucho.
2 people found this helpful
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