Pitt Artist Pens® in metallic colors offer odorless, permanent and water-resistant inks that will not bleed through paper. The pigmented India inks are lightfast, acid-free and pH Neutral. No need to pump, prime or shake. They work beautifully on all types of papers. High opacity even on dark paper. Bullet nib is 1.5 mm. Available individually or in assorted sets. Store horizontally when not in use.