Have you ever used “FRIXION BALL” which is a pen you can erase words. PILOT took 30 years to develop “FRIXION BALL.” They developed 10 kinds of pen which you can erase words. Now, a lot of people use this pen in offices and school. Do you know why this pen can erase words without an eraser? This is why words are erased by frictional heat(摩擦熱). Ink of “FRIXION BALL” is erased by heating. When you erase words, there are not trash. You can write words any number of times. It is very useful. If you are interested in this pen, you should try using “FRIXION BALL”!!!