Before all I'll apology for any further mistake in this text. English is not my Native language.
Regarding to the answer of the question, the actual size of a Table Tennis ball is 40 millimeters of diameter. To add some more information we can say that it's something recent because the size of the ball was always 38 millimeters and only was changed after the Olympic games of Sydney 2000.
The ITTF (International Table Tennis Federation) made the change with the objective of creating longer rallies and to make the ball more visible in the TV.
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