PREMIUM QUALITY-- Made from high quality plastic, durable and very convenient.It can be directly put into a school bag or handbag, you can use it anytime and anywhere. SIMPLE OPERATION-- Powered ...

The history of erasers dates back to the 1770s, when bread was the primary tool used to erase pencil markings. People would roll up and moisten bread to remove graphite marks effectively.

Magic Erasers, which are essentially melamine sponges, are made of melamine, an organic compound that is rich in nitrogen and surprisingly adept at cleaning gunk off car windows. Melamine is a ...

The pencil “lead” is actually a mixture of graphite and clay. More clay in the mixture makes the lead harder. A harder lead has a higher number. Pencils are numbered from 1-3 but most people use a ...