Uni-ball Eye UB157 Rollerball Pen Fine 0.7mm Tip 0.5mm Line Black Ref UB157BLK [Pack 12] A favourite for over 10 years. High-quality and reliable rollerball featuring waterproof pigment ink and 'Uni-Flow' system to ensure a continuous consistent write to the last drop. Stainless-steel tip with tungsten carbide ball. 0.7mm ball writes a 0.5mm line. Pack of 12 - vivid black ink.