Uni-ball Signo 0.7 Gel Grip Pen 65451, Blue Uni Super Ink. This Uni-ball Gel Grip Pen contains acid-free, gel ink that delivers exceptionally smooth writing and rich, vibrant color. Special formulated uni Super Ink becomes trapped in paper, helping to protect against water, fading and document fraud. Rubber grip provides comfort and control. Gel pen is nonrefillable.