ITEM NAME:DIY Balloon Power Car Opposite Reaction Children Science Educational Toys #gib Store Home Promotion Hot Item Add to Fav.Step four: put the EVA with holes on the head of the plastic pipe, put the balloon on it, and stick the double-sided tape to the straw. 1 x DIY Balloon Power Car Kit. Toys, Hobbies. Principle of product: the principle of Air pressure, power.
