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
Balls of Steel (video game) game and original voice-overs by Nukem actor Jon St. John. Pinball missions include fighting monsters like octabrains and pig-cops, and using powerups such as jetpacks and the Holoduke, from the Duke Nukem 3D video game. Graphics of a pinball game named "Balls of Steel" appear in "Duke Nukem 3D" itself, in the first level, "Hollywood Holocaust", when Duke encounters the table. "Balls of Steel" reappears in "Duke Nukem Forever". "Balls of Steel" was a finalist for "Computer Games Strategy Plus"s 1998 "Classic Game of the Year" award, which ultimately went to "Centipede". The editors wrote that "Balls of Steel" "demonstrated