Pilot Acroball Knock Ballpoint Pen, 0.7mm, Black(BAB-15F-BB),6 pens per Pack (Japan Import) [Komainu-Dou Original Package] Knock type. 6 pens per Pack. Ink color: Black The ball diameter: 0.7mm Smooth oil-based ink "Acro Ink" Rubber grip to be able to grasp well