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A ping pong ball is 40 mm in diameter and weighs only 2.7 grams. This is why ping pong balls are good for playing ping pong, but not very good to use for self defense.
http://www.ask.com/answers/107577961/how-much-does...
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Most people believe that ping pong balls are made out of plastic, but those people are wrong! The ping pong balls are actually made of celluloid which is a colorless, flammable material
http://answers.ask.com/Business/Finance/what_are_p...
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A ping pong ball is made of a thermaplastic called celluloid. It's not made of plastic. A cellulolid is used because it provides a stronger bounce and it loses only a small fraction
http://answers.ask.com/Sports/Other/what_is_a_ping...
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Accordiring to the new rule, the ping pong ball started out at 38mm in diameter which was much faster, but now it is 40mm in diameter. Ping pong is like table tennis.
http://answers.ask.com/Sports/Soccer/how_big_is_a_...
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