Wooden birch beads. 100 abacus bead parts. They are the same size as those used in regular abacuses. These are abacus beads from Banshu abacus, which boasts the largest abacus production in Japan. How about using them for handmade charms or making Japanese-style accessories? Diameter: Approximately 1.3cm Hole diameter: Approximately 3mm We try our best to ship quickly. Thank you.