Made from polyester resin which provides exceptional scratch and impact resistance. AAA Grade. Each ball is precision engineered for perfect roundness and balance, ensuring superior playability and durability. Each ball measure (2-1/4")57mm in diameter, and (5.9oz)168grams in weight. Set includes 16 billiard balls, 7 striped balls, 7 solid colored balls, 1 black art numbered eight ball, and 1 white cue ball. The set comes cased in a box. Great for game rooms, bars, sports match, leisure exercise, and players at all skill levels.