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1. Material: plastic 2. Can learn the knowledge of the teaching aids, help to recognize and observe the basic structure of the balloon helicopter 3. Helps to understand the basic flight principle of the helicopter, and can visualize the phenomenon of recoil 4. Training children practical ability, hand-eye coordination, exercise thinking, develop intelligence, inspire creativity, explore science 5. Through the model to understand the scientific principles, learning scientific knowledge, improve learning ability, develop children hands-on ability and knowledge 6. Weight: about 15g
