Kamiyo-saku, Isu-tama, 27-digit, Standard Soroban. It's rare to see a one-touch soroban other than those with birch beads or boxwood beads. Furthermore, even online, there's often no distinction made between old birch beads and Isu-tama beads when they are sold. Why not add this to your collection? Please specify whether you would like a case for a boy or a girl. Thank you for viewing.