FeaturesGel ink rollerball Broad tip for extra smooth writing performanceSmooth rubber grip for effortless writing control1.0mm nib that produces a 0.6mm writing lineInk Colour: BlackThis Uni-Ball Gel Impact Rollerball Pen 1.0mm (Pack of 12) contains ultra-smooth gel ink, which is fade-resistant, water-resistant and tamper-proof. The pen features a 1.0mm tip for a broad 0.6mm line width, and a rubber grip for comfort in use. This pack contains 12 pens with black ink.