Uni-Ball EYE UB-157 Rollerball Pen Medium 0.7mm Ball [Pack of 10] One of each colour The Uni-Ball UB-157 Gel Pen offers Outstanding Style with High Performance - A Favourite for over 10 Years! High Quality & Reliable Rollerball Featuring Water-Proof Pigment Ink & Uni-Flow System to Ensure a Continuous and Consistant Write to the Last Drop Stainless Steel Tip with Tungsten Carbide Ball - 0.7mm Rollerball Writes a 0.5mm Line One of each colour Pack of10