48 Wilson Duo 4A/AAAA Grade Golf Balls The world's softest golf ball achieved by a large rubber rich core, the DUO's groundbreaking 29 compression makes it the world's softest golf ball. Performance double take a high C.O.R. results in increased velocity and exceptional distance off the tee and with long irons. Its extreme soft feel improves playability around the greens. 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, white its Ionomer cover generated high-lift characteristics on tee shots and long approaches from the fairway