Mizuno JPX923 Forged irons are forged using the Grain Flow process in the brand's iconic Hiroshima factory at Japon. They offer an excellent balance between ball speed, stability and feel. Irons 4 to 7 benefit from Mizuno 's 3rd generation of Chromoly forging and feature more extensive milling from heel to toe. The thin face generates high ball speeds over a larger surface area. The top edge is thinner throughout the series, the short irons (8-GW) are compact and the bevelled sole improves interaction with the ground. Irons 4 to 7 3rd generation Chromoly forging with wider Microslot Irons 4 to 7 are forged from a block of Chromoly 4120 steel and milled from heel to toe. They deliver breathtaking ball speeds with a compact, easy-to-handle profile. The face is only 2.2 mm thick in the impact zone. Irons 8 to GW Carbon steel 1025E Pure Select For precision, control and feel in your short game. V-Chassis for a thinner top edge Developed as part of the Mizuno "Harmonic Impact Technology" project to deliver a more solid feel. Back edge with extra bevel The bevel on the back edge provides excellent ground interaction. Optimized short irons With a shorter, more compact head, 7 to GW irons offer more precision when you need it most. White-Satin finish The chrome finish is non-reflective to reduce glare.