The highlighter that you can erase! Simply use the rubber "eraser" tip at the top of the highlighter. The ink disappears cleanly, and there are no eraser shavings. FriXion ink is a thermosensitive ink that can be erased by rubbing. Interestingly, erased ink reappears at temperatures below 14 degrees Farenheit. It is advised against using FriXion for mailings, or leaving written materials in hot cars or in environments that expose them to a lot of friction.