Introduce about the abacus: 1.Soroban or an abacus is widely used in banks,businesses and at homes 2.Encased in a durable column represents a decimal point giving the total of a 13 digit number and beads are counted by sliding them on the rods. 3.When one of the columns is set as the ones column,in this case the 4th column from the right,the next adjacent to the left becomes the tens column,then hundreds,thousands,ten thousands and so on.The decimal fraction can be displayed on the right side of the ones column as well. 4.Abacus is also a very useful tool in general mathematics education because of its concrete visible display of numbers by beads that enable students to grasp of numbers, particularly in understanding place value. 5.This abacus features with a winding device Specification: Digit number:13 Material:Plastic frame and beads,bamboo rods Size:L 24cm x W 7cm x H 1.7 cm . weight:170g. Package Included: 1x Abacus