How To Use A Japanese Abacus: A step-by-step guide to addition, subtraction, multiplication, division, square roots and practical examples for the Japanese abacus (Soroban).
| Country | USA |
| Brand | EcoVessel |
| Manufacturer | Eco Vessel |
| Binding | Apparel |
| Size | 16 Ounces |
| UnitCount | 1 |
| ReleaseDate | 0000-00-00 |