uni-ball Vision Stick Needle Roller Ball Pens, Fine Point Pens, Assorted Colors, (2-Pack of 8) The needle-point design of the Unit-ball Vision Exact allows for thin and detailed writing, while the soft, comfort grip provides added control. Unit Super ink is specially formulated to become trapped in paper, helping prevent criminal check washing and other document alteration. Quick-drying, acid-free, archival-quality ink is fade- and water-resistant to last over time. Unit-flow system ensures a steady flow of ink for consistent line and color intensity. Visible ink supply so you know before you run out.