The ball

A cricket ball is between 8 13/16 and 9 inches (22.4 cm and 22.9 cm) in circumference, and weighs between 5.5 and 5.75 ounces (155.9g and 163g). Only one ball is used at a time, unless it is lost, when it is replaced with a ball of similar wear. It is also replaced at the start of each innings, and may, at the request of the fielding side, be replaced with a new ball, after a certain number of overs have been bowled (80 in Test matches, 34 in ODIs). The gradual degradation of the ball through the innings is an important aspect of the game.