The driver and FW5 are equipped with graphite shafts, while the other clubs have steel shafts. The clubs in the Callaway Warbird set are designed to provide both distance and height, while offering a high degree of forgiveness to make them easy to play with. The metal woods have a softer stiff-flex, while the irons have Uniflex, which corresponds to regular flex. The set also comes with a spacious cart bag that offers excellent storage options to suit all your needs on the golf course.