Wilson Staff Model Golf Ball The Wilson Staff Model® golf ball is a tour-caliber, four-piece urethane golf ball that delivers unmatched precision, speed and consistency. Featuring a medium-compression core, the Staff Model feels great off the club head and achieves flatter trajectories on drives and approach shots from distance. Each Staff Model ball is painted using a finely controlled application process that ensures a nearly flawless finish, resulting in the highest-caliber performance.