Uni-ball Eye UB-150 Blue rollerball pen

The Uni-ball Eye UB-150 is a world-renowned rollerball pen specifically manufactured by the Mitsubishi Pencil Company in Japan. Established in 1887, the Mitsubishi Pencil Company has a rich history in the stationery industry, originally focusing on wood-cased pencils before expanding into high-quality writing instruments like the uni-ball line introduced in 1979.

Despite the name, Mitsubishi Pencil Co., Ltd. is not related to the Mitsubishi Group of companies (the conglomerates behind automotive and electronics). It remains an independent entity headquartered in Tokyo, Japan. The 'Eye' series, also known as 'Vision' in some markets, is famous for its waterproof and fade-proof 'Uni-flow' ink system, which ensures a consistent flow of ink until the very last drop. These pens are primarily produced in Japanese facilities to maintain high manufacturing standards for global distribution.