Pitt Artists' Pens by Faber-Castell are made with the finest pigments for unsurpassed lightfastness. The acid-free archival ink is smudge-and waterproof when dry. Suitable for sketches, studies, and ink drawings, the PITT artist pen has a long life and is easy to use. Available in three classic ink colors: black, sepia, and sanguine, and four line widths: superfine, fine, medium, and brush. Black also available in extra superfine line width.