FeaturesMedium line 0.7mm rollerball writing pen for smooth flowing writingGenerous ink reservoirunique eye feature allows you to see exactly how much ink is leftColour: BlackPack of 12The Uni-Ball UB-157 Eye Rollerball Pen Medium (Pack of 12) features a medium 0.7mm nib for a 0.5mm line width, which is ideal for detailed work. The pen contains liquid Super Ink, which is fade resistant, water resistant and tamper proof. The unique system provides a continuous flow of ink down to the last drop for smooth, consistent writing. This pack contains 12 black pens.