Faber-Castell India ink PITT Artist Pens combine the advantages of artist's inks with the convenience of the modern disposable pen. Contains acid free, odor free, pH neutral pigmented drawing ink. There is no need to pump or shake PITT pens and the ink is waterproof and permanent. The ink has a high light resistance and excellent opacity, even on dark paper. This set contains 3 pens with 2mm chisel nibs, perfect for calligraphy.