Zebra Sarasa Clip 0.3 Gel Ballpoint Pen Black Ink Refills, 0.3mm, Set of 5 (Japan import) [Komainu-Dou Original Package] Refill for Zebra Sarasa clip 0.3 JJH15-BK gel ballpoint pen Ink color: Black The diameter of a ball: 0.3 mm. extra-fine type.