Wilson Staff Duo Golf Balls (12-Pack) rubber Imported Achieved by a large rubber-rich core, the DUO's groundbreaking 29 compression makes it the World's Softest golf ball A high C.O.R. results in increased velocity and exceptional distance off the tee and with long irons This ball is extremely soft feel improves playability around the greens The 2-piece construction delivers minimal spin off the driver face to aid in accuracy off the tee A seamless 302 dimple pattern produces a consistent ball flight