Uni-ball Signo Gel 207 Retractable Roller Ball Pen, Eight-Color Set Smooth. Real Smooth. Gel ink technology for a smooth write Vibrant, pigmented gel ink is acid-free Pigmented gel ink is fade- and water-resistant. Stylish textured grip provides writing comfort and control. Semi-translucent barrel to monitor ink supply. Sturdy metal clip. Refillable. Black, red, blue, pink, orange, light blue, purple and green.