Rollerball pen with waterproof ink features an ultra-smooth tip to provide a relaxed, comfortable writing experience. Super-Flow-System delivers a consistent flow of ink from start to finish for legible handwriting. Large ink reservoir has a level indicator to allow you to monitor your ink supply and prevent unexpected depletion. Cap-off ink does not run dry even if the cap is removed for two to three days. Ergonomic rubberized grip zone helps you maintain a secure grasp for relaxed writing.