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
Cue sports where it originated, was originally called the "winning and losing carambole game", folding in the names of three predecessor games, "the winning game", "the losing game" and "the carambole game" (an early form of straight rail), that combined to form it. The game features both (caroms) and the pocketing of balls as objects of play. English billiards requires two and a red . The object of the game is to score either a fixed number of points, or score the most points within a set time frame, determined at the start of the game. Points are awarded for: Snooker is