It is a replacement core of oil ballpoint pen. Size: length 88mm, width 3mm, thickness 3mm. Ink color : Black. 0.7mm.
OHTO CO., LTD. is a Japanese pen manufacturing company selling the OHTO brand. The company was established in 1929 as a manufacturer of dyes and ink. In 1949, the company became a pen manufacturer. OHTO manufactured world's first pencil-shaped ballpoint pen with chrome ball. This is the first MADE IN JAPAN ball point pen. Also OHTO has developed world's first water-based ballpoint pen (present day Roller Pen,) as well as the world's first roller pen with ceramic writing ball, CERAMIC ROLLER PEN.