Policy: Please feel free to contact us, any problem will be solved in the best possible way Reset button: Soroban's reset button is very convenient to use. When you have finished processing a record and move on to the next record, carefully press the reset button to return to the original state Perfect finish: Soroban's frame is polished and round without burrs, so you can use it comfortably Increased intelligence: The use of the attack increases the practical ability of the child and stimulates the activity of brain cells, which improves the level of intelligence of the child Material and size: The Soroban consists of 13 types and 5 beads. It consists of a plastic frame, beads and bamboo stakes. Its size is 24.6 x 7 x 1.8 cm. Soroban style chart ideal for quick calculations. -This abacus is wrapped in a sturdy plastic frame and fitted with bamboo sticks. -It is a user-friendly abacus / soroban recommended for use in any math soroban course. Features: Number of digits: 13. Material: plastic frame and balls, bamboo sticks. Size (L x W x H): approx 25 x 7.5 x 2 cm. Scope of delivery: 1 x abacus with 13 bars. (zhongchengdaye)