Wilson Staff Model X Golf Ball The Wilson Staff Model® X golf ball is a tour-caliber, four-piece urethane golf ball that delivers unmatched precision, speed and consistency. Made for players who want a firm, fast ball, the Staff Model X goes longer and has more spin off the tee and off of irons. Each Staff Model X ball is painted using a finely controlled application process that ensures a nearly flawless finish, resulting in the highest-caliber performance.