This is a Pilot Frixion Erasable Rollerball pen which is a rollerball pen that produces ink that can be instantly erased if you make a mistake. This pen comes with a rubber tipped end that erases ink cleanly using friction-generated heat. With this unique new Pilot pen you can write, then instantly erase and re-write with ease. Featuring a fine 0.7mm tip and removable cap with clip, these Pilot Rollerball pens enable smooth, fluid handwriting, making them ideal for everyday home or office use. Not recommended for signatures, legal documents or other documents where writing needs to be permanent. If document is exposed to heat, this ink may disappear.