Pilot FriXion Black Ink 0.5mm Erasable X-Fine Point Roller Ball Pens - 6 Pack Pilot Frixion Black Erasable 0.7mm Fine Point Roller Ball Gel Ink Pens - 6 Pack FriXion Erasable Gel Pen allows you to erase and rewrite repeatedly without damaging documents Thermosensitive, gel ink formula disappears with erasing friction of rubber plug eraser on the pen Unique, thermo-sensitive gel ink formula disappears with erasing friction Ink is thermosensitive and disappears with erasing friction