Pentel Ballpoint Pen Vicuna X, 0.5mm, Blue Ink(BX105C-C), 3 pens per Pack (Japan Import) [Komainu-Dou Original Package] Knock type Ballpoint Pen. 3 pens per Pack. Ink color: Blue The ball diameter: 0.5mm Smooth oil-based ink. Rotation of the ball is smooth by using the new lubricant to the ink.