Portable Arithmetic Soroban W/ Colorful Beads Mathematics Calculate Tool Abacus Overview Soroban style abacus, great for rapid calculation. This abacus is encased in a durable plastic frame and suspended with bamboo rods. It is a user-friendly abacus / soroban which is highly recommended for use in any math abacus / soroban course. Traditional arithmetic abacus, a classic tool that is still fully functional 13 bamboo rods, with 1 bead above and 4 beads below on each rod Well made plastic frame and beads A nice tool for kids' early mathematic education Can be used as classical calculator in office, education tool for teacher or a gift for abacus collectors Size (L x W x H): Approx. 8 x 2.5 x 0.6 inch Material: Plastic frame and beads, bamboo rods Color: Black frame, colorful beads Package includes: 1 x Abacus