Pilot 11372 FX1R3BLK FriXion Pen Refills, 1.0mm Bold Point, Black Erasable Gel Ink. Pack of 3 refills fits FriXion Ball, Clicker and Frixion LX erasable gel ink pens. FriXion refills have a unique Thermo-Sensitive Gel Ink Formula that disappears with erasing friction. Rewritable-erase and rewrite repeatedly without damaging documents - No wear or tear! Bold point 1.0mm. For use with Pilot P1A11384 FriXion Ball Clicker pens.