13 Digit Rods Standard Abacus Soroban Chinese Japanese Calculator Counting Tool 8" 13 digit professional soroban style abacus with plastic frame. Beads Number: 5 Beads Per Row x 13 Rows Measures 8" x 2.5" x 0.75" (20.5cm x 6.3cm x 1.5cm) Both practical and educational. (Instruction not included) Stock in the US! Fast Shipping !