The colors range from various shades for warm or cold weather temperatures. The referees decide which color ball will be used by dropping them from a height of 3 feet onto the playing surface. The ball when dropped from a height of 3 feet will not rebound more than 8 inches on the first bounce and no more than 2 inches on the second bounce. The ball with the least amount of bounce determines which ball will be used. If the bounce is the same the referees shall decide which ball will be used. Once the game is underway the color or type ball can be changed.