Insight Stick Rollerball Pens, Medium Point, Bue Ink, Pack of 2 Stylish rollerball pen with consistent smoothness and color intensity. Uni Super ink is specially formulated to become trapped in paper, helping prevent criminal check washing and other document alteration. Archival-quality and acid-free ink for documenting and record-keeping Exclusive uni-flow ink system regulates a steady flow of waterproof ink to the point for consistent smoothness and color intensity down to the last drop of ink. Ink-o-meter allows for visible ink supply so you know before you run out.