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sponge rubber ball, 6.3cm baseball, softball, basketball, soccer, football… easy to handle: the wrist band ball is very convenient for you to handle, diameter for each ball is about 4.7 cm/ 1.85 inches applicable occasions: our wrist bouncy ball are suitable for many occasions, ideal choice for exercise: if you like ball sports exercise, our sports bouncy ball may be an ideal choice for you; reliable material: our stress ball is made of rubber, it is very soft to touch and smooth on the surface, hard to deform or break.syi