Acid-free, water resistant, archival ink protects your sketches, drawings and anime from fading over time. Unique, tungsten carbide roller ball tip guarantees a consistent line from the first to the last drop of ink. Pen will not dry out if left uncapped. 4-Pack contains 4 different tip sizes: 0.3mm, 0.4mm, 0.5mm and 0.6mm. Black Ink.