uni-ball Signo Roller Ball Stick Gel Pen, Black Ink, Medium, Dozen Features uni-Super Ink that helps prevent against check and document fraud. Gel ink produces vibrant colors and smooth, effortless writing. Comfortable grip reduces writing fatigue. Point Size: 0.7 mm; Point Type: Medium; Ink Color(s): Black; Pen Type: Roller Ball. Comfortable grip.uni-ball