This article is from the Table Tennis (Ping Pong) FAQ, by ttennis@bu.edu with numerous contributions by others.
3.3.1 The ball shall be spherical, with a diameter of 38mm.
3.3.2 The ball shall weigh 2.5 gm.
3.3.3 The ball shall be made of celluloid or similar plastics material and
shall be white or yellow, and matt.
 
Continue to: