If the bottom layer of the blackboard material is stainless steel or iron sheet, you can use magnets to attract the teaching AIDS.

The magnetic blackboard itself is not magnetic, but an iron plate. The reason why the magnetic blackboard can fix pictures, papers and teaching AIDS is because small magnets are used to fix these pictures, papers and teaching AIDS. When a small magnet is placed on the blackboard, the iron blackboard is magnetized and becomes magnetic, so it attracts each other.