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
Six-red snooker as a sideshow, involving one-frame knockout matches. In the final veteran Tony Knowles defeated 13-year-old Ross Muir 52–18. Tickets were initially free; however, future events would have been pay-to-enter. The first world championship was held in Ireland between 15–18 December 2009. Mark Davis beat Mark Williams 6–3 in the final, becoming the first world champion of the six-red snooker format. Since this time, the six-red World Championship has been contested in the regular season calendar, and also in the Asian Indoor and Martial arts games. Six-red snooker Six-red snooker (sometimes spelled six-reds, 6-red, and also known as super 6s), is