Similar to a technical pen, the Faber-Castell Pitt Artist pens are designed for precise and detailed work. They are ideal for sketching, studying, and inking. Made with waterproof pigmented India ink, artwork won't fade or bleed. Acid-free and pH neutral. - Faber-Castell Pitt Artist Pen - Black, Extra Fine NibFaber Castell Pitt Artists Pen, BLK XS -