Callaway X-Forged irons. New for 2007, Callaway's X-Forged irons are world class clubs for world class golfers - as used by, among others, Ernie Els. A forged, notch back blade iron designed for elite golfers seeking the ultimate in shot-making and distance control. Forged 1020 Carbon Steel Construction provides unmatched feel and performance, giving golfers incredibly soft, responsive feedback at impact. Tour-inspired styling with thin top-line, narrow sole, shorter blade length and minimal offset deliver the aesthetics and shot-shaping ability better players demand. Flighted CG (Centre of Gravity) Design has centre of gravity strategically positioned lower in the long irons and progressively moves higher through the set, providing ideal trajectories and precision distance control. Notch Back Design increases stability through impact, enhances feel and keeps the CG close to the face for maximum workability.