Unshudo Abacus, 23 Digits, 4 Beads, 34400, Birch Beads

Abacus for general office use and children. Meticulously adjusted to withstand years of use. [Birch Beads] Birch: A type of tree. Dense, hard wood. Birch beads are brown and are the most commonly used. Suitable for beginners to advanced users. [Abacus Features] - Learning to use an abacus is said to improve not only calculation ability, but also concentration and perseverance. - The bead material is carefully selected and carefully adjusted for long-term durability, making it safe for use by both beginners and advanced users. [Target] Beginners [Frame Shape/Material] Flat/Laminated Wood [Bead Material/Quality] Birch Beads (Medium) [Size] 336 x 62 x 19 mm [Weight] 220 g