Industry-leading Ball Speeds From Flash Face Cup Technology For the first time, Callaway has used Artificial Intelligence in an iron. Callaway created a sophisticated face architecture that’s unique to every loft, so they can create a significant boost in ball speed and increased spin robustness off of every iron. And ball speed is further enhanced by our 360 Face Cup that flexes and releases at impact. Optimal Launch From Tungsten Energy Core The custom tungsten-infused weights in each iron allow Callaway to locate the position of the CG in each iron with extraordinary precision while still maintaining ball speed in the Flash Face Cup. This promotes optimum launch and ball flight through the set, from strong lofts and player preferred...