Professional Pool Ball Set, 2-1/4" Extreme workmanship is used within these high quality Polyester Resin Billiard Ball Sets. Weight, Hardness and Roundness of balls all meet international billiards standards Balls have a professional high glossy finish The number is inlaid on both sides of the ball and the color is specially treated to prevent wear after the heaviest of table play Close attention is paid to the color process to ensure consistent color