After 2 days of use the first ball broke and all the small gel balls ran out. Choosing the carpet was no fun. So the second ball, which also lasted 2 days. I didn't use the remaining 2 stress balls in this 4 pack but I expect they won't last long either. I'm not particularly strong so I'd say these balls aren't durable. Apart from the novelty of the colors they are not very good, I would not recommend.
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