limited offer US $8.37 Happyxuan Ball Emitter Kids DIY Science Experiment Kits Wood Assemble Electric Model Fun Physical E

Happyxuan Ball Emitter Kids DIY Science Experiment Kits Wood Assemble Electric Model Fun Physical E

[32842386653] Happyxuan DIY Small Ball Emitter Children Science Experiment Kits Assemble Electric Model Kids Inventions Educational Toy ​ Product material:wood and electric components Product size:100*190*80mm Principle of work:After assembling , the two motors run up on the contrary direction at a high-speed, ,when the ball hit on the wheels installed on the motor will be with two high-speed rotating wheel friction and extrusion, the ball will have the same speed with the both sides of the wheel, then it will be thrown out, the higher the motor speed, thrown out faster. Note:the price is for 1 set,batteries are not included.  

US $12.88

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