Unshudo Solomatic 23-digit USM-200 Abacus with Cover Beads

One-touch cancellation. Perfect for speeding up calculations. Comes with a hard case. [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 meticulously adjusted for long-term durability, making it safe for use by beginners and advanced users alike. [Features] One-touch cancellation / [Case] ​​Hard case included (magnetic) [Target] For advanced users [Frame Shape/Material] Triangular (eyelet reinforcement) / African ebony [Bead Material/Quality] Birch beads (top) [Size] 334 x 66 x 19 / Weight 400g