Rollerball with ultra-smooth tip for the best writing experience. Line width approx. 0.6 mm, writing color red, waterproof according to ink standard ISO 14145-2. The innovative Super-Flow system guarantees consistent ink flow from start to finish. It's great for notes and signatures or visualization. The large ink tank has a level indicator and every drop of ink is used. Capped paint does not dry even if the cap is removed for 2-3 days. The One Business has a durable metal clip and an ergonomically rubberized grip area that provides a secure hold for relaxed writing.