The Uni-Ball Air UBA-188M roller is perfect for calligraphy and lettering. It writes like a fountain pen. The unique tip allows you to adjust the intensity and thickness of writing depending on the pressure and angle. The “Uni-Ball AIR” tip... minimizes friction and contact with the paper, ensuring smooth writing from the very first stroke, freely and quietly. Uni-Ball AIR combines the softness of marker writing with the durability of a ballpoint pen. Direct ink flow until the last drop. Pigment ink is resistant to fading and water washout. The body of the roller is made of polypropylene, and the tip is made of tungsten carbide.