The Pilot FriXion Gel Pen PIL31551 is an erasable gel pen that allows you to erase and rewrite repeatedly without damaging documents. Its thermosensitive gel ink formula disappears with the friction of the rubber plug eraser on the pen, leaving no residue or debris. This pen delivers smooth writing and is not recommended for exposure to extreme temperatures or for use on signatures, examination papers, or official documents where writing needs to remain permanent.