Pilot FriXion Refills 12511 FX7R2GRN, Green Erasable Gel Ink, 0.7mm Fine, Pack of 2. Fits Pilot FriXion Ball, Clicker and LX 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! Fine point 0.7mm. Writes smooth, erases clean. Refills fit FriXion Clicker pens number P1A31453