Pitt Artist Pens offer odorless, permanent and waterproof inks that will not bleed through paper. The pigmented India inks are lightfast, acid-free and pH Neutral. 2.5 mm chisel tip is ideal for calligraphy, creative lettering, journaling, scrapbooking and other paper crafts. Available individually or in assorted sets. Store horizontally. For Ages 13 and up. WARNING: CHOKING HAZARD - Small Parts. Not for children under 3yrs.