AIR Porous Roller Ball Pen, Stick, Medium 0.7 mm, Blue Ink, Black/Blue Barrel, Dozen Smooth writing porous roller pens adapt to your personal grip style for effortless writing at any angle. Medium 0.7 mm tip offers stunning visual appeal with a vivid color payoff. Suitable for a variety of writing tasks and creative projects with the fluid ink of a marker and the durability of a rollerball. Water and fade-resistant ink helps you compose long-lasting, high-quality documents you can archive. uni Super Ink entraps the gel ink in the paper, creating a strong bond that resists document fraud. uni-ball Corporation guarantees smooth, worry-free writing with every uni-ball® pen.