Uni-ball (ユニボール, Yunibōru) and Uni (ユニ, Yuni) are brands of pens and pencils, made by the Mitsubishi Pencil Company Limited (三菱鉛筆株式会社, Mitsubishi Enpitsu Kabushiki Gaisha) of Japan. The brand was introduced in 1979 as a rollerball pen model, then expanding to the rest of Mitsubishi Pencil products.