The official rules of Table Tennis state that the ball shall:
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The official rules of table tennis state that the ball shall be:
* spherical, with a diameter of 40mm and
* weigh 2.7g and
* be made of celluloid or similar plastics material and
* be white or orange, and matt
The official ping pong ball is a hollow sphere made of plastic and 20 mm across. The mass is measured at 2.7 grams.