The Aramith Tournament set features the Duramith technology with its hi-tech engineered molecular structure enhancing drastically the longevity of the balls while minimizing significantly table cloth wearWith 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 the trade and the playerWith its new Duramith formulation, the 4th generation Aramith 4 life products cross new boundaries, guaranteeing the lowest cost of ownershipThe cloth wear and white marks that so easily ruin the look of the table are minimizedThe friction resistance of Aramith Tournament balls minimizes burn spots as well