These metallic pens work beautifully on all types of paper as well as canvas. The 1.5mm bullet nib applies rich metallic pigment and can also be used for inking small stamps. They are ideal for working on dark surfaces, producing shimmering results. These pens are made with professional-quality odorless India ink that is waterproof, lightfast and archival; the ink won't bleed. The 4-Pen Wallet Set includes metallic PITT artist pens in green, ruby, silver and gold.