Here is the refill of the Frixion Ball pen by Pilot and Craft Design Technology.

Frixion wipes clean as it uses the heat generated by friction to erase its own ink. The heat generated by the cancellation makes the exclusive thermosensitive gel ink become clear so that the words disappear completely. Unlike other erasable pens, the gum will not rub, so the paper will not be torn or ruined. Use the frixion ball recharge. Craft Design Technology combines modern design with the Japanese heritage of impeccable craftsmanship and technological innovation. Injecting tradition, innovation and simplicity into everyday essentials, they make minimalist artwork out of normal office supplies.s4902505437847