It has been determined by the International Table Tennis Federation that it is difficult to watch and enjoy table tennis matches on television due to the speed of the game. One simple way of slowing down the game is to increase ball size. It has, therefore, been determined by the International Table Tennis Federation that table tennis matches should be slowed down by increasing the size of the table tennis balls.
Changing the diameter of the table tennis ball from 38 mm to 40 mm is enough of a change to enable users to effectively watch and enjoy table this matches, without otherwise affecting the game. Therefore, the International Table Tennis Federation has mandated that ball size for table tennis matches be changed from 38 mm to 40 mm.