Designed for professional golfers, the Callaway Steelhead X-14 iron set offers distance, control, and comfort. With stainless steel construction, these Callaway irons are durable and sleek in touch. The Callaway Steelhead X-14 has Variable Face Thickness (VFT) technology that adjusts the thickness and raise or lower the center of gravity in order to maximize the trajectory with each iron, in this iron set. The thickness of the face in this Callaway irons set tapers from top to bottom and heel to toe, thus increasing forgiveness and enabling great twists at impact.