Wilson Staff D-FY Hyrbid Irons Combo, Set of 8 (FY, 4H, 5-PW) Steel and graphite combo for low to mid swing speeds Seamless performance with built in distance gapping Patent pending half and half shafts adds club head speed and overall distance The graphite portion extends from under the grip through the mid section The steel portion extends from the mid section through the tip of the shaft Removing unnecessary weight from under the hands, and providing extremely high vibration dampening Providing low torque at the tip for straighter shots on off center hits