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 m most paper. Use for graphics, journaling, scrapbooks, memos, illustration, drafting, archival recording, cartooning, and accounting. pH neutral. Ideal for acid-free environments. Chemical resistant.