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Anonymous
International rules state the ball shall weigh 2.7 grams and be 40 millimeters in diameter.
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The International Tennis Federation specifies that a tennis ball used for their tournaments must weigh between 2 ounces and 2 1/16 ounces.
There are two sizes of snooker balls.
2-1/4" which weighs 163 grams / 5.7oz
2-1/8" which weighs 140 grams/ 4.9oz