Zebra 1.0mm Black Ink Refill (JF-1.0), for Zebra Sarasa Clip 1.0 Gel Ballpoint Pen(JJE15-BK), &times; 5 Pack/total 5 pcs (Japan Import) [Komainu-Dou Original Package] Refill for Zebra Sarasa clip 1.0 gel ballpoint pen (JJE15-BK) Ink color: Black The diameter of a ball: 1.0 mm. Broad type.