The Aramith Tournament pool ball set features the Duramith technology with its hi-tech engineered molecular structure enhancing drastically the longevity of the balls while minimizing significantly table cloth wear. With a life-time that exceeds up to 8 times that of the average polyester and phenol-like resins, reaching easily up to 40 years in residential use, Aramith ball sets are the logical choice for both commercial and residential use. They are 2-1/4" in diameter,the standard for pool play. Set includes 15 numbered balls and one cue ball. MADE IN BELGIUM.