UZZO Mini Plastic 13 Column Abacus Arithmetic Soroban Calculating Tool, 13 Digits Rods With Colorful Beads,Kids Educational Tool Material: Plastic frame and beads, bamboo rods 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 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