The older 38 mm Table Tennis balls as of the year 2000 were officially substituted by 40 mm balls. This is now the standard. The international rules specify that the game is played with a light 2.7 gram, 40 mm diameter ball. At the same time, 2.67 to 2.77 grams is deemed acceptable. In the same way diameters of 39.5 mm to 40.50 mm may be used.
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