Gel RT Retractable Pens, Medium Point, Black Ink, Pack of 4. Gel ink pen provides a smooth writing experience similar to a roller ball pen with the durability of a ballpoint pen. Uni Super ink is specially formulated to become trapped in paper, helping prevent criminal check washing and other document alteration. Visible ink supply so you know before you run out. Smooth, rubber grip offers supreme comfort for effortless and controlled writing. Retractable tip for added convenience. 0.73 inches long by 3.75 inches wide by 7.62 inches high. 0.16 pounds. UPC for this product is: 70530659481 Related search terms for this product include: uni ball, uni-ball, retractable pen, gel pen, ink pen.