I think ping pong has a smaller ball
Squash
A squash ball typically contains natural rubber, various types of plastic, and chemical compounds like antioxidants and accelerators. These chemicals are used to give the ball its desired elasticity, bounce, and durability.
Pickle ball Squash
The little ball on your squash racket is used to absorb the shock when you hit the ball. Once you get your strings changed, though, you no longer need the ball because the strings that you get put on your racket are generally better than the ones that your racket came with. If you take off the little ball with the original strings, you will probably be able to feel a little difference when you hit the ball (it might vibrate a little).
Wilson.
The sport is probably squash, although the ball doesn't have to be black.
The diameter of a tennis ball is 2.63 inches, or 6.7 centimers. A squash ball's diameter is between 39.5 and 40.5 millimeters.
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Ping Pong Ball / Table Tennis Golf Ball Cricket Field Hockey Lacrosse Billiards / Pool Squash Are all smaller in diameter than a baseball
Yes squash ball is between 23 to 25 grams, and golf balls can get up to 46 grams
It is a sport where you hit a rubber ball, that is slightly smaller than a tennis ball, against a wall and when it bounces back, your opponent must hit it. It would be similar to playing squash using your hand instead of a racket.