Erasers are mainly divided into plastic erasers and rubber erasers. Plastic rubber, due to its polypropylene base, has a strong plastic texture. Its characteristic is that it appears semi transparent when placed under strong light sources. When erasing, rubber shavings generally do not form strips, but rather small pieces or particles. Some exquisite and cute erasers with various shapes in stationery stores are actually plastic erasers. Although they look good on the outside, they are not very effective to use. It is not recommended to use them, especially for students to answer exams. Rubber eraser, generally used for drawing erasers such as 2B and 4B, belongs to rubber eraser. Compared with plastic eraser, rubber eraser will wipe cleaner. Its characteristic is softness, and it will be found opaque when facing strong light sources. The rubber shavings that have been wiped out are relatively long and slightly inconvenient to handle.