They need to be squeezed like a stress ball, but if kids squeeze them, they'll break within a day or two. I went through this whole box with my four kids in such a short amount of time that it wasn't worth it. I have to say they really liked them but I just can't replace them every time they break because it happens so often. I personally like how they feel and maybe a teenager could make them last longer. My children are 3-8 years old.
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