Tsuge (Boxwood) Beads, 27 Digits, Standard, with Case This is a Unshu Soroban (abacus) with boxwood beads. This item has been stored for a long time, and there are no problems with the movement of the beads. I think it's a good choice for those who are learning to use an abacus for the first time. Please specify the color of the case when ordering. Red or blue. However, only one blue case remains. Thank you for looking.