Master craftsman of Gyokusan-do, Shinonome, made one-touch abacus, 23 digits. This is a one-touch abacus with boxwood beads from Gyokusan-do, the pioneer of one-touch abacuses. It is a 23-digit abacus with boxwood beads that is very easy to use. Those who wish to purchase this item, please understand that it has been used at least once.