Abacus 13 Digit Rods Standard Chinese Soroban Japanese Calculator Counting MathUS SELLER - FREE DELIVERY via USPS First Class with Tracking Number PRODUCT DESCRIPTION The abacus is a calculating tool that was used for centuries before the adoption of the written modern numeral system. The abacus is still widely used by merchants, traders and clerks in certain parts of the world such as Asia and Africa.In addition to being a professional tool, the soroban or abacus is also an educational tool.The abacus is widely used in teaching children counting and mathematics.People who become proficient in the use of the abacus almost automatically become adept at mental calculation.This abacus has a plastic frame. Its classical, standard design allows for its ease of use as a professional and educational tool. Product Feature:Type: Chinese AbacusMaterial: ABS (Frame), Painted Plastic (Beads)Beads Number: 7 Beads Per Row x 13 Rows29*11cm/ 11.42*4.33 inch14 ouncesPackage Content:1x Abacus Track Page Views With Auctiva's FREE Counter