Feature:1. Learning Meaning: Abacus allows people to visually and tangibly move beads as they count, add, subtract, multiply, identify place value, and more.2. Comfortable Hand Feeling: Abacus beads are polished smoothly and finely, particles are full, and workmanship is fine and rigorous to promote ease.3. Made Of High Quality Materials: Math Concepts Blind Abacus is made of high quality ABS materials, durable and not easy to damage, can be used for a long time.4. Main Function: Abacus for the Blind perfect for teaching children and for adults to do quick calculations.5. Fine Production: Design of rounded corners, no sharp corners, will not scratch the hands, and it is safer to use.Specification:Item Type: Abacus for The BlindSize: Approx. 16 x 9 x 1.1cm or 6.3 x 3.5 x 0.4inMaterial: ABS.Package List:1 x The Blind Abacus