Xtreme Golf Balls New PXG Xtreme Premium Golf Balls deliver big distance, snappy green-grabbing control, and a slick new alignment aid to help you sink more putts. Features: High C.O.R. polybutadiene core created for high-speed performance Firm ionomer mantle layer engineered to increase speed and distance off the tee Soft urethane bright white outer cover designed to maximize spin and control for your approach shots and around the green with exceptional durability 338 dimple pattern engineered