Traditional arithmetic abacus, a classic instrument that is still fully functional 13 bamboo sticks, with 1 bead up and down 4 beads on each rod Good made plastic frame and beads A nice tool for early mathematical Children Education Can as a classical computer in the office, educational tool are used for teachers or a gift for abacus collectors Soroban abacus style, fast calculation. This abacus is encased in a sturdy plastic frame and suspended with bamboo poles. It is a user-friendly abacus / soroban, strongly recommended for use in any math abacus / Abacus course. Size (L x W x H): 8 x 2.5 x 0.6 inches Material: Plastic Frame and beads, bamboo sticks Color: black frame, colorful beads Package Contents:1 x Abacus Note:Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3 cm.