Pilot 77350 FX5R3BLK FriXion Clicker 05 Extra Fine Point Refills, Black Erasable Gel Ink. Fits FriXion Ball and Clicker erasable gel ink pens. FriXion ball pens 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! Extra fine point 0.5mm. For use with Pilot P1A32520 FriXion Ball Clicker pens.