Horizon Gel Needle-Point Refill by OHTO – Little Otsu

Black ink refill for the OHTO Horizon Needle Point Gel Pen. It will also fit in the GS01 and the Mark's Days Metal Needlepoint Gel Pen. Black ink, needle point 0.5mm. Model number PG-105NP. Made in Japan. This refill does not fit in the OHTO Horizon Ballpoint Pen.
Black ink refill for the OHTO Horizon Needle Point Gel Pen. It will also fit in the GS01 and the Mark's Days Metal Needlepoint Gel Pen. Black ink, needle point 0.5mm. Model number PG-105NP. Made in Japan. This refill does not fit in the OHTO Horizon Ballpoint Pen.

Time for Paper Gel Pen by Mark's – Little Otsu

OHTO 895NP Needle-Point Ballpoint Pen Refill - 0.5 mm - Black

Pen Review: Ohto Horizon Needlepoint Ballpoint - The Well-Appointed Desk

Time for Paper Gel Pen Refill by Mark's – Little Otsu

Ohto Pencil Ball & Horizon Pen Needlepoint 0.5mm Refill - 895NP

Ohto 0.5mm Black Oil-based Ink Refill (No.895NP), for Ohto Needle Point Ballpoint Pen, × 6 Packs/total 6 pcs (Japan Import) [Komainu-Dou Original Package] : Office Products

bLen Pen 0.5 Refill by Zebra – Little Otsu

OHTO Needlepoint Ballpoint Pen Refill PS-107NP

NPD] OHTO Horizon gel pen, would recommend : r/pens