Pilot Frixion is a truly unique type of gel rollerball, which erases cleanly, leaving no debris. This feat is achieved by the use of friction generated heat from rubbing with the pen's rubber end stud. FriXion lets you write, erase and re-write, all with the same pen. The pen features smooth gel ink to ensure a comfortable writing experience as the pen glides across the page. The pen is easily refillable with a twist-action barrel to replace the refill.