This set is ideal for hand lettering and creative card making! Pitt Artist PensÃƒâ€šÃ‚Â® in metallic colors have a 1.5mm bullet nib. The India inks are odorless, permanent, water-resistant, lightfast, acid-free and pH Neutral. There is no need to pump, prime or shake like other metallic art pens. They have high opacity even on dark paper. The pens are also ideal for sketches, drawings, layouts, fashion design and illustration. Store horizontally when not in use.