Pilot Acroball Knock Ballpoint Pen, 0.5mm, Red(BAB-15EF-RR), 3 pens per Pack (Japan Import) [Komainu-Dou Original Package] Ink color: Red The ball diameter: 0.5mm Smooth oil-based ink "Acro Ink" Rubber grip to be able to grasp well 3 pens per Pack