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What are the allowed thicknesses of the shell of a tennis ball? I know the external diameter, but I'm interested in what thickness is allowed for the shell itself. I don't have a ball at hand to cut open...

(If there's a difference between e.g. ATP and WTA regulations, please mention both).

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    About 3 mm... – user527 Aug 16 '12 at 0:50
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    Welcome. This is not a constructive question. Perhaps enlightening us as to why this is important to you would help. – wax eagle Aug 16 '12 at 1:08
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    I've tried to reformulate this into a "rules and regulations" question rather than an off-hand request for information. I'm not saying it's a great question, but I think it now counts as on-topic. – Philip Kendall Mar 8 '16 at 20:02
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The standard thickness of a pressurized tennis ball shell (eg, the tennis ball is intact and fresh removed from its airtight container) is about 3 mm.

The standard thickness of an unpressurized tennis ball shell (eg, if a tennis ball is cut open) is about 4 - 4.5 mm.

The US Patent for a tennis ball states that "the wall thickness of the shell is between 1.2 and 2.8 millimeters."

The ATP and WTA both reference the ITF's Appendix I with respect to tennis ball measurements. Thickness of the shell is not mentioned.

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