FRIXION is the product name of a revolutionary ballpoint-pen. It seems to be just an ordinary ballpoint-pen -- it will be difficult to distinguish this pen from any other pens. Its colors, writing touch, thickness, and size are just the same as other rollerballs. However, that is the greatest point of this pen while it has a really great function which is hidden in its ink. The lines and characters written with this pen can be erased just by rubbing on it with a rubber tip built into the end of the pen body, and you can re-write and re-erase on the same paper again and again. Sure, the same things can be done using traditional pencils and erasers, but pencil lines are not so stable and the powder of pencil lead soils the surface of the paper over a long time. On the other hand, this rollerball has both the benefit of traditional rollerballs and pencils -- it is literally an "erasable rollerball." The mechanism of the erasability is quite simple. The ink has the nature of turning itself colorless over 60℃. This temperature looks so high as an air temperature but it can be reached very easily by rubbing or whatever heating. I experimented by drawing lots of thick lines with this pen and erasing them at one time using a hair dyer. It worked perfectly!