Description: Abacus: The abacus also called a counting frame, is a calculating tool, Chinese abacus dates to the 2nd century BC, Knowns as the Suanpan. Function: Abacus can be used for functions other than counting for elementary schools kids, very efficient suanpan techniques have been developed to do multiplication, division, addition, subtraction, square and operations at high speed. Design:13 Rows, Vintage Chinese Wooden Bead Arithmetic Abacus, there are two beads on each rod in the upper deck and five beads each in the bottom, The beads are usually rounded and made of a polished hardwood and very durable. Applications: Good for school elementary math teaching aids and Kids addition and subtraction counting. Chinese Wooden Abacus: Conducive to cultivate and improve children's computing power, memory and attention, Espacially for elementary Kids. Specification: Material: Wood Size: 28cmx11.8cmx2cm/11.00.79x4.65x2inch Package Includes: 1 Piece Abacus Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful online shopping!