New Soroban 23-digit Wooden One-touch Abacus Banshu Craftsmanship Soroban Kaba Beads Soroban Classroom Comes with a dedicated hard case Ono City, Hyogo Prefecture Traditional Craft Banshu Soroban High-grade Kaba Beads Perfect for soroban classrooms! If you purchase this soroban, you can aim for a dan ranking and won't need to buy another one.