PING I59 #4-PW IRONS FST KBS TOURAlumiCore Technology 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, elevating the MOI to match that of the larger PING i210 iron. MicroMax Milled Grooves The precision machined face has new MicroMax grooves for tighter spacing and a geometry that results in an average of four extra grooves to reduce fliers in the