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The product is based on the automobile airbag systems .When the ball is hit heavily, the in-house material will chemical reaction, so the ball will be filled with a plenty of gas. By using the rapid expansion, the Hope-Ball will support the weight of a normal person.
You can easily collect it when it is not on use. It has a tiny size , a soft shape and a lovely colour.
Yanan Wang,Ning Zhang,Mei He,Shanshan Gao