uni-ball&Acirc; Signo Gel 207 Roller Ball Retractable Gel Pen, Assorted Ink, Medium, 36 Per Set Sold as 36/Set. uni Super InkTM specially formulated to become trapped in paper, helping prevent criminal check washing and other document alteration. Textured grip provides superior writing comfort and control. Stylish metallic accents with a high quality finish. Archival quality and acid-free ink for documenting and recordkeeping.