The Wilson Staff Di5 Distance Irons has a unique cavity undercut and heel notch. The top-line width progressively increases from the short irons to the long irons and weight is gradually shifted away from the face, improving perimeter weighting and forgiveness. A sizeable high COR thin face reinforced with a lightweight carbon weave support, as well as an increasing offset, helps players square the club at impact. The result is an improved feel and longer, straighter shots. With a low density carbon weave support, the Di5 features a thin, high COR face to provide a generous sweet spot in a conventional head size. Weight in the Di5 is moved from the heel area in the short irons to a lower, deeper position in the long irons where the weight is needed for maximum forgiveness and higher trajectories. Both steel and graphite shafts in the Di5 iron provide a flexible tip section for a higher launch in the long irons progressively changing to a stiffer tip section in the short irons for a lower, controlled ball flight. The Di5 features either a steel True Temper proprietary Wilson Staff Taper Tech .370 tip shaft or a graphite UST proprietary Wilson Staff Nano Tech .370 tip shaft. The graphite shaft design features our Nano Tech shaft technology for higher torsional stability. Golfers who require the distance of long irons but desire greater forgiveness now have the option of the immensely hittable hybrid clubs. Hybrid clubs in 17.0°, 21.0°, 25.0°, 29.0° lofts are available individually or as optional clubs in the Di5 set.