Developed with professional manga artists, this set is ideal for comic and manga drawing. 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. Store horizontally when not in use. For ages 10 and up. WARNING: CHOKING HAZARD - Small Parts. Not for children under 3yrs.