Pilot Frixion Clicker Erasable Black Gel Ink Pens, 12 Pens with 2 Packs of Refills 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!