The erasable Frixion Clicker is a unique retractable gel pen that contains thermo sensitive gel ink | The heat generated by friction when rubbing the paper with the special tip turns the ink invisible | With no damage to the paper, you can erase and instantly re-write over your mistakes | Perfect for everyday use at home, work or school | Retract the tip by clicking the convenient pocket clip | Refillable with Frixion refills | NOTE: Do not use Frixion Pens on legal documents or cheques, or when writing exams