Zebra JK-0.5 Black Ink Refill (RJK-BK), 0.5mm, for Sarasa Multicolor gel ballpoint pen, &times; 5 Pack/total 5 pcs (Japan Import) [Komainu-Dou Original Package] Refill for Sarasa Multicolor gel ballpoint pen(Sarasa 3, Sarasa 4, Sarasa 3B), and Sarasa Multi-function gel ballpoint pen(Sarasa 2+S, Sarasa 2+SB, Sarasa 3+S) Pen tip diameter: 0.5mm Ink color: Black