Digital Standard Abacus-25.4 Cm-Professional, Functional And Educational Tool Product Details the abacus from ancient China; its characteristic is that the counting system used before modern numbers is still used by some businessmen, traders and clerks. It is a good tool for mathematics education. This 17-digit professional abacus is made of high-quality ABS plastic and measures 10.5 x 2.5 x 0.75 inches (26.5 x 6 x 1.5 cm) An abacus that makes math exercises more effective; using an abacus to calculate children's mathematical ability is a good way to teach them to count and calculate intelligence It can be used as a classic office calculator, a teacher's, an educational tool for children or a gift for abacus collectors. The abacus is very suitable for fast calculations. It is highly recommended to use it in any math abacus course Payment We accept PayPal and credit cards via PayPal. Taxes - US We collect sales tax, as required by law. Shipping We make every effort of shipping within 3 business day of payment clearing. The estimated delivery time is 2 - 5 business days from the shipping date. Policies If you do need to return your item, please contact us via email (you will receive an email when your product ships with additional details - Subject: Important information about your purchase). You will then be provided with a return shipping label and packing slip. Pack the item carefully. Include the packing slip, apply the shipping label, and return the item within 30 business days of the date you request a return, or your return will be canceled. Once we receive your order we will inspect the return. Please allow up to 5 business days of receiving the returned item for your refund.