Callaway X-20 irons. New for 2007, Callaway X Series iron technology combines with traditional styling for tour-level looks and feel. The Callaway X-20 Tour irons advance that heritage with design elements more accomplished players will relish. With a shorter blade length, a narrower sole, thinner top-line and square toe, these irons have all the elements better players seek for increased workability. The shorter blade length and minimal offset offer enhanced workability. The heel design helps in reducing turf drag through the rough while the longer hosel helps strategically position the centre of gravity for optimum trajectory control. A 360-Degree Undercut Channel uses patented technology and maximizes perimeter weighting by moving the centre of gravity lower and further back in the clubhead, enlarging the hitting area and stabilizing the clubhead for more forgiveness.