Standard erasers inevitably become rounded with use. SEED's Kadoloop Eraser is unique in that it has self-reshaping capabilities allowing you to restore the sharp corners and edges for more precise erasing. The eraser is made from a special heat-softened material that will soften when heated in hot water for 20-30 seconds or if it's warmed with a hair dryer. Once the material is soft, you can press it into the included transparent plastic shaping mold to regain it's sharp corners.