The Pentel Arts Hybrid Technica Gel Pen contains acid-free, water-resistant, archival Ink that will protect your sketches, drawings and anime from fading over time. The 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 during use. Pack includes 0.3mm, 0.4mm, 0.5mm, 0.6mm and 0.8mm tip sizes.