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PROFESSIONAL RELIABILITY GOES BACK CENTURIES: This digit standard abacus/ soroban calculator is the abacus in classical form, featuring the system used before modern numerals that are still used in parts of the world by merchants, traders, and clerks.A GREAT EDUCATIONAL TOOL: When learning on the abacus, math practice can be more effective because you may remember more. This makes using an abacus for kids math a great way to teach them how to count and equate and is widely used this way.SOLID PLASTIC FRAME: Quality design has been taken to the next level with this digit standard soroban abacus with a plastic frame, making it a decorative piece that's home friendly.FEATURES MODERN CONVENIENCES: This 17 digit professional soroban abacus is a sturdy abacus set made to stay put, measuring in at 10.5 x 2.5 x 0.75 in (26.5cm x 6cm x 1.5cm).