Zebra F-0.7 Black Ink Refill (BR-1B-F-BK), for NuSpiral CC 0.7mm Ballpoint Pen (BA51), &times; 6 Pack/total 6 pcs (Japan Import) [Komainu-Dou Original Package] Pen tip diameter: 0.7mm Ink color: Black Oil-based Ink Refill for NuSpiral CC 0.7mm Ballpoint Pen (BA51), NuSpiral T 0.7mm Ballpoint Pen (BA52), Zebra 0.7mm F-301A (F-301A-BK), Folder tier 300(BA80), Folder tier ST Cap(BA91).