Hot Launch E523 Irons These hollow iron-wood designs put a major emphasis on ease of launch, playability and correcting miss-hits and slices to go straighter for the ultimate in ease of use.The improved hollow-body design of the Hot Launch E523 Iron features the game-changing Houdini Sole in conjunction with a super-shallow face, slice-fighting offset designs and heel weighting for added draw bias. FEATURES HOUDINI SOLE TECHNOLOGY Reduces turf interaction by 35% and dramatically moves weight low