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This soroban is a 23-digit standard wooden soroban with a re-set button. By using the re-set button, you can set the soroban to the zero position. You can solve more problems in a shorter time because of this time-saving mechanism. This soroban is thoroughly recommended, for those who want to progress in their soroban work, and for those who would like to become faster or who wish to take part in competitions when speed is of the essence.