Unshudo Abacus Solomatic with Birch Beads 23-digit USM-250

[Features] One-touch reset mechanism [Case] Hard case included (magnetic closure) [Target audience] Advanced level [Frame shape and material] Triangular, African ebony [Ball material/quality] Kava ball (top) [Dimensions] 334 x 66 x 19 mm / Weight: 200 g