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Officially, 40mm in diameter.

Originally, Table Tennis balls were officially 38mm in diameter. It wasn't until October 1st, 2000 that the ITTF changed the official ball size from 38mm to 40mm.

The reason for the change was to make the game more appealing to spectators by slowing down the ball.

There are some recreational ball sizes that are played with for fun such as the 46mm ball (huge!).

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