Blackboard eraser is an essential tool in classroom teaching, used to remove chalk marks from the blackboard. It is made of sponge, which can effectively absorb and erase chalk dust, while reducing dust flying and keeping the classroom air clean. In classroom teaching, teachers can use a chalkboard eraser to quickly clean up the content on the board and make room for new teaching materials. The bottom of the blackboard eraser is equipped with magnetic material, which can be easily attached to the blackboard frame to avoid loss. The practicality and convenience of the blackboard eraser make it an important auxiliary tool in the teaching process.