Ping i59 Iron Set 3 PW Steel Shaft 10 with vertical zip pockets to 4994857128672 with vertical zip pockets to keep your necessities safe and tailored seams to keep you looking sleek FLTD CG is a strategic design that positions the center of gravity lowest in long irons and progressively shifts it higher throughout the set Alumi Core technology is an aerospace grade aluminum insert allows approximately 30 grams of material from the center of the club to be redistributed to the perimeter in the form of toe and shaft tip weights Toe and tip weighting elevate MOI to reduce the stat area and achieve a level of forgiveness unprecedented in a forged design