Amazingly erasable and precise. FriXion erasable gel pens allow you to write, erase and rewrite without damaging documents or leaving behind messy eraser crumbs. The unique, thermo-sensitive gel ink disappears with erasing friction. FriXion Ball. Pen Sub-Brand & Product Family: FriXion® Ball Erasable; Pen Type: Gel Pen; Pen Style: Stick; Pen Tip Type: Conical.