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
Joe Perry (snooker player) led 8–7 and had potted a colour to leave his opponent, David Gray, requiring a snooker – however, Perry's pot had also left him snookered on the final red, which he failed to hit, allowing Gray to clear the table and ultimately win the deciding frame with a total clearance of 139. This run left Perry provisionally fifth in the world, but he failed to win a match in the remaining five tournaments and dropped to 14th at the end of the season as a result. In 2005, he lost to eventual champion Ding Junhui. In the 2007/08 season, he