Because of the various types of billiard games there are different types and sizes of pool balls used. There are pool balls sized 2 3/8 inches in diameter for games such as three ball; pool balls sized 2 1/8 inches for bumper ball; and pool balls sized 2 1/4 and 2 1/16 inches for snooker, eight and nine ball. There are also miniature pool balls on the market that are only 1 ½ inches in size.
Each pool ball is usually controlled according to seven pieces of criteria: density, balance, diameter tolerance, sphericity, colour, surface polish and brilliance.
Pool balls numbered from 1 to 15, which are solid and striped, are called Boston ball sets. Snooker ball sets are solid in color and there are 21 balls in a set, plus a cue ball. These balls weigh between 5 ½ and 6-ounces each. Prices for pool ball sets range from approximately $40 to $300.
There are also different styles of novelty pool balls available for a visual affect. These novelty style pool balls include glow in the dark pool balls - used with a black light, and poker ball sets - which come in Ace, King, Queen and Jack instead of numbers. Other novelty-style pool balls include stone ball sets - which look like imitation bedrock, marbleized ball sets, sparkle ball sets, see-through ball sets, and clear ball sets. You can also buy specialty logo ball sets with NFL, Major League Baseball, Walt Disney, and Harley Davidson themes. All of these pool balls are built to specification, and are made to jazz up your pool game in style only. Novelty ball sets cost approximately $30 to $300.
There are also ball accessories available to clean or wash your billiard balls. An automated machine that washes and polishes the balls using a liquid polish will cost you a few hundred dollars. There are also ball carrying trays and cases available in order to properly move and protect your pool balls.