There are three Waboba surf balls that are under the size of a tennis ball. This is the largest. The orange and grey one is in the middle, then the "surf" which is pink and blue is the smallest. I have all three. So far as I can tell they're all made of the same materials, and hold up equally well. They're remarkably novel, and quite fun to play with, so I recommend them highly. Being the largest of the three, this is aimed more for adults adults with decent arm strength to play with. The pro is noticeably heftier. imagine throwing an apricot vs throwing an apple - the pro is the apple, and suitable for anyone who would be comfortable throwing a baseball a decent distance, while the "surf" is the apricot, and more suitable for children.For the record, the "surf" is great fun for adults too.
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