They are not durable. My 7 year old daughter took them to school to use when she was nervous. It only lasted part of her day when it exploded on her after squeezing it with both hands. My 11 year old's ball already has a small hole in it after 2 days of sporadic use. When I photographed the hole, the liquid ran all over the floor. At $4 a ball it was a rip off.
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