The UB-150 Eye broad rollerball has a 1.0mm nib and offers precision whilst also producing a smooth and broad line.This uni-ball makes use of vivid black pigment ink that will not run even when water is spilt, the nib is stainless steel making it durable and able to withstand pressure. This is a great everyday pen for use at home, work or at school.. 1.0mm stainless steel nib. Water-based pigment ink that does not run. Clear vivid ink producing strong broad lines. Approximate dimensions (mm) H 140 W 76 D 25