Cue sports playing nine-ball. Snooker balls are smaller than American-style pool balls with a diameter of 52.5 mm ( in), and come in sets of 22 (15 reds, 6 "", and a cue ball). English billiard balls are the same size as snooker balls and come in sets of three balls (two cue balls and a red, an object ball). Other games, such as bumper pool, have custom ball sets. Billiard balls have been made from many different materials since the start of the game, including clay, bakelite, celluloid, crystallite, ivory, plastic, steel and wood. The dominant material from 1627 until the
Power Snooker 2011 to a red striped ball. On the Power Snooker table, the is known as the Power Zone. Any potted from a shot originating in the Power Zone counts for double, and if potted during a Power Play, quadrupled. In 2011 this was extended to the as well. If a player during a Power Play or in the Power Zone, their points penalty doubles, and if the foul shot originated in a Power Zone and during a Power Play, the penalty quadruples. In contrast to traditional snooker, in which play occurs in quiet surroundings, with an audience expected to remain