Pilot Acroball Knock Ballpoint Pen, 1.0mm, Black(BAB-15M-BB),3 pens per Pack (Japan Import) [Komainu-Dou Original Package] Knock type. 3 pens per Pack. Ink color: Black The ball diameter: 1.0mm Smooth oil-based ink "Acro Ink" Rubber grip to be able to grasp well