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Abacus/Rekenrek 20 bead sloped version, 24 x 4.5 x 6 cm; made of recycled wood; very stable design with stainless steel rods; beads have a diameter of 13 mm Counting and all basic arithmetic operations (addition, subtraction, multiplication and division), but also number size comparisons in the range 0 to 20 can be learned or consolidated easily and vividly Conforms to toy standard DIN EN71-3 Made of re-wood (100% recyclable, certified with the PEFC seal and free of harmful substances) Made in Germany