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
Rules of snooker of snooker is to strike the white "cue ball" with a cue so that it strikes the "object balls" in turn and causes them to fall into one of the six pockets. Points are scored for potting balls legally, in accordance with the rules described below, or in the event of a foul committed by the opponent. The player who scores more points wins the frame, and the first player to win a set number of frames wins the match. A match usually consists of a fixed, odd number of frames. A frame begins with setting up the balls as