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        Suitable for children over 6 years old to build

The set contains 80 modeling and related construction steps instructions, modeling principles, actual object pictures, etc. 

The modeling design is simple and easy to understand, and clearly reveals the most basic principles of mechanical power transmission. 

Through the construction activities of the set, it helps every beginner to systematically and progressively learn the knowledge of structural stability, gear transmission, 

axle transmission, pulley principle, lever principle and so on.

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