Universal One Roller Porous Tip Stick Pen, Black Ink, Medium, Dozen The smooth writing action of this porous-tip pen makes it a pressureless pleasure to use. Precision tip produces consistent, clean lines. Vividly Colored Ink tastefully draws attention to itself. Marks lines and are quick-drying which reduces the chance of smudging. Point size: 0.7mm; Tip Type: Medium; Ink Color (S): Black; Pen Type: Roller Ball. Vividly Colored Ink. One-year limited manufacturer's warranty.