Cobra King CHR Iron Set MULTI MATERIAL CONSTRUCTION-Strategically placed tungsten inserts are co-forged in the heel and toe help to increase MOI and also help position the CG directly behind the impact zone CENTERED CG-To enjoy pure strikes and consistency in every shot, you need the optimum Center of Gravity (CG) placement. The CG in the KING Tec irons is positioned directly behind the center of the face for more precision shot control J15 FACE INSERT-A new forged high strength steel face insert is thinner, lighter and hotter delivering more distance across the face. The saved weight from this J15 structure is moved lower and deeper in the head for longer, higher flying straighter shots FORGED FEEL-1025 Carbon Steel head is forged 5X to deliver a more refined grain structure and precision shaping that provides soft yet solid feel on every shot PROGRESSIVE SPIN TECH-CNC Milled faces and wedge style grooves also deliver maximum spin and more consistent launch trajectories in every iron