Fill in the blanks: According to official rules, a standard table tennis ball has a diameter of:
40 millimeters
Under the International Table Tennis Federation (ITTF) rules, the standard table tennis ball has a diameter of 40 mm. The ball weighs 2.7 g, is spherical, and is usually made of plastic (since 2014; earlier celluloid).
The earlier 38 mm ball was used until 2000, when the ITTF switched to the 40 mm size to slow the game down for spectators. 42 mm and 44 mm are not standard sizes.
Hence the correct answer is 40 millimeters.
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