Features: Specifications; this is a 13 digit professional soroban abacus Professional tool; the soroban or counting tray is a classical form of the abacus; the abacus is a calculating tool that was used for centuries before the adoption of the written modern numeral system; it is still widely used by merchants, traders and cle Educational tool; in addition to being a professional tool, the soroban or abacus is also an educational tool; the abacus is widely used in teaching children counting and mathematics; people who become proficient in the use of the abacus almost automatically become adept at mental calculation; instructions are not included Standard design; this soroban abacus has a plastic frame; its classical, standard design allows for its ease of use as a professional and educational tool Specifications: Color:As the picture shows Material:Plastic Size: 12.5x7.5x2.5cm(4.92x2.95x0.98inch) Quantity: 1Pc Note: 1.Transition: 1cm=10mm=0.39inch 2.Please allow 0-3cm error due to manual measurement. pls make sure you do not mind before you bid. 3.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: (Without retail package) 1Pc x Plastic Abacus Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.