Zig Memory System pens are made of archival-quality pigment ink. Fade-proof, waterproof, non-bleeding, and acid-free (pH 7.0 or higher). They ensure long life for crafts, scrapbooks, and other artistic endeavors. Set contains 5 black pens in line sizes: 005, 01, 03, 05, and 08.
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i had some of these years ago - no issues - these i just bought to restock and they last less than one week of writing and not constant use - completely disappointed - spend money elsewhere