Can be adsorbed on the blackboard: you can use it with confidence, abacus for learning mathematics. For teachers only: magnetic teaching tools, for teachers only, the back of the abacus has strong magnetic force and can be adsorbed on the blackboard. Thickened material design: made of thickened ABS plastic material, bright colors, not easy to scratch hands. Educational abacus: Arithmetic abacus is a still fully functional tool that helps people with hand-eye-brain coordination. Using an abacus as a math teaching tool can make math practice more effective, is a good way to teach calculation, and makes learning much easier.