Genuine Pilot FriXion Pen Refills P1AFX725BLU, Bulk Pack of 25, 0.7mm Fine, Blue Gel Ink. 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.