Pigmented India Ink in multiple nib sizes and 58 colors brings great versatility to pen-and-ink drawings requiring lots of intricate details. Pitt Artist Pens are great for sketching, journaling, cartooning, and drawing. The Superfine, Fine, Medium, Bullet and Brush nibs not only replace ink bottles — they're instantly available for work. The ink is waterproof, unsurpassably lightfast, acid-free, and pH-neutral. The nib size is prominently displayed on the end of the cap.