uni-ball Onyx Roller Ball Stick Dye-Based Pen, Red Ink, Micro, Dozen The precision tungsten ball provides a long-lasting write. Excellent for use on carbons and multi-part forms. Easy-to-hold matte black barrel prevents writing fatigue. The sturdy metal roller point with liquid ink ensures a flawless writing experience. Point Size: 0.5 mm; Point Type: Micro; Ink Color(s): Red; Pen Type: Roller Ball. Easy to hold matte black barrel.uni-ball