The new rule calls for a ball with a 40 millimeter diameter. The
previous specification called for a 38 millimeter diameter ball.
Tournaments sanctioned by the International Table Tennis Federation and
itís national governing bodies around the world, have adopted the 40
millimeter ball specification beginning in the year 2000. It remains to be seen
however, how quickly recreational-type tournaments will adopt the new
size and how soon the public will be buying the 40 millimeter ball
through sporting goods stores and various other retailers.
Celluloid or similar plastic material may be used to make
table tennis balls.
2.7gm is the weight specified by the official rules.