UNSHUDO 23-digit abacus with case. - Brand: UNSHUDO - Price: ¥2,000 [Specifications] Abacus pack, 23 digits [Case] Comes with a cloth case for children [Material] Frame/beads: Plastic [Number of digits] 23 digits [Bead color material] Birch-colored beads [Main unit dimensions] 33 cm Thank you for looking. This is an abacus for children. Curved design that fits comfortably in the hand. It has a substantial weight (178g) and emphasizes stability. Uses birch-colored beads to reduce calculation errors. This is an old item, and the case has stains. I do not smoke and do not own pets.