Table tennis balls,
also known as ping pong balls, are small, lightweight,
hollow spheres made of plastic and cellulose materials. The balls measure 40
mm (1.57 inches) in diameter and weigh 2.7 g. This type of ball is used in a
game (trademark of ping-pong) similar to tennis, but played on a table with
paddles and a light hollow ball. Initially, the quality of the new plastic
balls was not up to par, causing much frustration and anger in the table
tennis community.If you are serious about playing table tennis competitively,
you should definitely use the new plastic table tennis balls.