uni-ball Products - uni-ball - Signo Gel GRIP Roller Ball Stick Gel Pen, Red Ink, Medium, Dozen - Sold As 1 Dozen - Rubber grip. - Vibrant, Pigmented, acid-free gel ink. - Features Uni-Super Ink&trade; that helps prevent against check and document fraud. Rubber grip. Vibrant, Pigmented, acid-free gel ink. Features Uni-Super Ink that helps prevent against check and document fraud.