Pilot FriXion Refills P1AFX725PPL, Purple Gel Ink, 0.7mm Fine, Bulk Pack of 25. Refills fit 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! Fine point 0.7mm. Writes smooth, erases clean.