The Callawayreg; HX Diablo Tour Golf Ball offers an exemplary combination of distance off the tee and pinpoint control on approach shots. Its Power Reaction Core is firmer on the outer edges and gradually gets softer on the inside, creating less spin off of driver shots and more spin when using shorter irons. A thin Ionomer cover allows for aggressive shot-making and improved short game control in one great 3-piece performance ball.