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
Snooker than doubled from £3 million to more than £7 million. The objective of the game is to score more than one's opponent by potting in the correct order. At the start of a frame, the balls are positioned as shown, and the players then take turns to hit shots by striking the cue ball with the of the cue, their aim being to pot one of the red balls into a pocket and thereby score a point, or, if this is not possible, to at least hit a red ball so as to avoid making a foul shot. If the