Pentel® Wow 0.7 MM Retractable Gel Roller Pen Features Blue Ink That Creates Smooth, Clean Lines. Triangular-Shaped Barrel And Grip Offer A Comfortable, Easy Hold And Prevent Rolling For Stable Placement. Features A Latex-Free Grip. Permanent, Acid-Free Ink Is Waterproof And Fade Proof To Ensure Your Work Lasts.