Pigma Micron pens are fine point writing instrument offers a waterproof, quick-drying pigment ink. Fade proof and smudge proof on porous surfaces, including 100% cotton fabrics. Will not smear or feather when dry. Fade resistant. Does not bleed through most paper. Use for graphics, journaling, scrapbooks, memos, illustration, drafting, archival recording, cartooning, and accounting. pH neutral. Ideal for acid-free environments. Chemical resistant. Also available in sets.