Metal frame: With metal frame, it becomes a decorative piece. Lightweight: Suitable for daily carrying, can be easily stored in a bag, and can be used for a long time. Calculation tool: It can be used as a classic calculator in the office, a teaching tool for teachers, or as an abacus collection. Move beads up and down: It is a calculation tool that can perform complex calculations by moving the beads up and down, by feeling and observing the beads. 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.