You are buying one sets of mathematics tool, soroban (abacus).
Abacus, soroban is widely used in banks, business and at schools. Encased in a durable wood frame and suspended with rods, the top beads represent 5 and bottom beads represent 1. Each column represents a decimal point giving the total of a 12 digit number and beads are counted by building them on the rods.
Abacus is also a very useful tool in general mathematics education because of its concrete visible display of numbers be beads that enable students to grasp of numbers, particularly in understanding place value.
The abacus features with a winding device.
Digit number:12
Size: 10.5 X3.5 X 0.75 inches