Mitsubishi gel refill 0.38 UMR38S.33 Mitsubishi pencil 4902778261422 (10 sets)

Ball diameter: 0.38mm φ6 x total length 112mm 2.4g The notebook fits perfectly. A refill for Uni-Ball One that has deep black and vivid colors. Gel ink ballpoint pen. UMR-38S. ◆Ink color: Blue ◆One ink ◆Body: UMN-S-38