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This ballpoint refill with black ink suits the OHTO Horizon GS01 Ballpoint Pen.

OHTO was established in Tokyo, Japan in 1929 and began manufacturing high quality dyes & inks. The company has a long history of ink manufacturing as the founder of OHTO, Nakata Tozaburo, worked for the ministry of finance and invented a special ink for Japanese banknotes. Mr. Nakata went on to develop the first ballpoint pen manufactured in Japan in 1949. After the success of their 'Auto-Sharp' ballpoint pen, OHTO went on to design and manufacture the world's first rollerball pen in 1964.