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This is a ball for dog. And inside of the ball, here is a reaction ring. When the dog touch or bite it, it will become large. Whengas pressure reaches a certain degree can make the pressure of the valve opening elastic sphere, sphere bleed away. And the ball will fly, like a balloon. The dog will chase it. This is an interesting cycle. And the reaction principle is similar to the airbag, when the dog touch it or bite it, the reaction will happen. The ball can repeatedly play.
Sishuang Wang ,