uni-ball Stick Micro(.5MM) Point Roller Ball Pens. 12PK, ASSORTED Classic rollerball pen writes as smoothly as a fountain pen, without the mess. Uni Super ink is specially formulated to become trapped in paper, helping prevent criminal check washing and other document alteration. Quick-drying, water-resistant ink provides neat, accurate lines. Stainless steel point provides added strength and durability. Attractive black matte finish with strong, long-lasting metal clip.