The UB-150 Eye broad rollerball has a 1.0mm nib and offers precision whilst also producing a smooth and broad line.This pack of 5 uni-balls have 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. Pack of 5. Water-based pigment ink that does not run. Clear vivid ink producing strong broad lines. Approximate dimensions (mm) H 197 W 112 D 20