Pressureless and Pressurized Balls
On the left was a pressureless Wilson Trainer ball. On the right was a pressurized Wilson US Open ball.
The overall thickness of both rubber cores were similar. When new, their weights and bounce were similar too.
What differed was that while the trainer ball had a single rubber core, the US Open had dual layers of rubber, one dark brown and one white.
Just sharing, if you are curious...
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