Zebra 0.4mm Black Ink Refill (JF-0.4), for Zebra Sarasa Clip 0.4 Gel Ballpoint Pen(JJS15-BK), &times; 5 Pack/total 5 pcs (Japan Import) [Komainu-Dou Original Package] Refill for Zebra Sarasa clip 0.4 gel ballpoint pen (JJS15-BK) Ink color: Black The diameter of a ball: 0.4 mm. Fine type.