Pilot FriXion Clicker Retractable Gel Ink Pens, Eraseable, Fine Point 0.7 mm, Black Ink (314505P) ink refills, with 3 refills per pack 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!