In 1887 a man named Niroku Masaki started a small company making pencils in Tokyo. Almost 100 years later in 1979, the first Uni-ball rollerball pen was created.
The quality and writing performance made it an instant hit in Japan and America. Fast-forward another 15 years to 1994 and the Eye rollerball that Uni-ball is now known for was created. Since then it's popularity has continued to grow, making it one of the world's most popular rollerball pens.