1. Material: plastic2. Can learn the knowledge of the teaching aids, help to recognize and observe the basic structure of the balloon helicopter3. Helps to understand the basic flight principle of the helicopter, and can visualize the phenomenon of recoil4. Training children practical ability, hand-eye coordination, exercise thinking, develop intelligence, inspire creativity, explore science5. Through the model to understand the scientific principles, learning scientific knowledge, improve learning ability, develop children hands-on ability and knowledge6. Weight: about 15g Specification: Package Weight One Package Weight 0.02kgs / 0.04lb One Package Size 12cm * 5cm * 1cm / 4.72inch * 1.97inch * 0.39inch…