WRITES LIKE A GEL PEN, ERASES LIKE A PENCIL: FriXion lets you write smoothly but leaves room for error. Unique Thermo-Sensitive gel ink formula disappears with erasing friction. These are compatible with FriXion Ball, Clicker, and Retractable pens. PILOT FRIXION ERASABLE GEL PENS combine the convenience of a retractable pen with the incredible FriXion erasable gel ink. Erase and rewrite repeatedly without damaging documents. WRITE & CREATE FEARLESSLY: If you love FriXion erasable ink pens & markers, you'll want to try Pilot's full line of erasable Clickers, ColorSticks, Fineliners, Colors Marker Pens, & Highlighters.