The erasable Pilot Frixion Ball is a unique gel pen, perfect for everyday use at work, home or school | With no damage to the paper, you can erase and instantly re-write over your mistakes | The friction-generated heat caused when rubbing the paper with the special tip turns the ink invisible (put the document in the freezer and the ink re-appears) | Frixion Ball is available in a range of exciting colours | Refillable with Frixion refills | NOTE: Do not use Frixion Pens on legal documents or cheques, or when writing exams