Champion Balls is an expert in polyester resin billiard balls,features a hardened fade-resistant luster technology coating for superior scratch resistance and long color life.Quality control for size, roundness, density, balance, weight, color, hardness,superior playability, and durability. Made from polyester resin which provides exceptional scratch and impact resistance - A Grade - Each ball is precision engineered for perfect roundness and balance, ensuring superior playability and durability - The regulation size bumper pool balls measure 2-1/8" - Set includes 10 balls (4 red, 4 white, and 2 spotted balls)