G irons are heat treated using a specialized process, creating a Hyper 17-4 alloy that is 40% stronger than traditional 17-4 SS. This allows the faces to be thinner and provide four times the face flexing with improved stability. The results are big distance gains and a higher peak trajectory for better stopping power so you can hit and hold the green.COR-Eye Technology generates sizeable distance gains by simultaneously activating the sole, face and top rail in flexing for consistently faster ball speeds across the hotter face. In addition to four times the face flexing, the G head is more stable and forgiving.Connecting the Custom Tuning Port to the sole creates a deeper CG that helps elevate the launch angle while increasing MOI for greater accuracy.At address, the iron’s refined look is created by a thin top rail, satin-blast finish and appropriate offset. An enlarged multi-material damping badge joined to the cavity works with COR-EyeTechnology to optimize sound and feel.Contributing to improved performance in the G irons are PING's proprietary AWT 2.0 Ascending Weight Technology shafts, an optimal combination of physics and feel. They get lighter as they progress from the short irons to the long irons. Lighter long-iron shafts help square the clubfaceto increase clubhead speed for distance and accuracy. Short iron/wedge shafts are heavier for improved trajectory control and feel. Features:COR-Eye TechnologyThis unique structure involves the entire face in flexing for consistently faster speeds across the hotter face. The increase in speed and shot height generates distance and a steep landing angle so shots hit the green and hold the green. Enhanced Sound & FeelAn enlarged multi-material damping badge joined to the cavity works with COR-Eye Technology to provide exceptional sound and feel.  Perimeter WeightingWeight saved from the face was allocated to the low toe and perimeter, creating a high MOI for extreme forgiveness.  CTP Elevates LaunchConnecting the Custom Tuning Port to the sole creates a deeper CG that helps elevate the launch angle while increasing MOI for greater forgiveness.  AWT 2.0 Shaft InnovationPING’s proprietary Ascending Weight Technology shafts improve performance through an optimal combination of physics and feel. They get heavier as they progress from the long irons to the short irons and wedge. Lighter long-iron shafts help square the clubface, increase clubheadspeed, and optimize flight for distance and accuracy. Heavier short iron/wedge shafts improve trajectory control and feel.