P770 Irons Forged Hollow Body Construction The forged hollow body construction gives golfers the best of both worlds; beauty and performance. A soft 8620 carbon steel body is paired with an incredibly thin forged 4140 steel face and Thru-Slot Speed Pocketâ„¢ for a design that is fast, flexible and forgiving even in a compact head shape FLTD CG FLTD CG strategically positions the center of gravity (CG) the lowest in the long irons and progressively shifts higher throughout the set. Using up to 46g