The Uni-Ball Eye Rolerball Pen is perfect for cursive writing, sketching and technical drawing. The UB-150-10 Rollerball has a slim 1.0mm stainless steel nib with a water-based pigment ink that delivers consistent ink flow. This Super Ink helps give the pen a smooth, fluid and precise line as you write however the ink is also waterproof, fade and even tamper proof. Meaning it\'s impossible for people to change any important documents you may have written with the pen. At the side of the pen is a window barrel helping you to keep track of how much ink you have left in the pen. Highly recommended for its versatility, it\'s a fantastic everyday use pen at home, work or university. - 1.0mm stainless steel nib - Water-based pigment ink that does not run, doesn\'t fade and is tamper proof - Clear vivid super ink producing strong broad lines - Colour is Black - Approximate dimensions: height - 140mm, width - 76mm, depth - 25mm