"Cobra King OS Black 8PC Combo Set - Graphite The Cobra King OS Iron Sets offer Cobra's largest iron face, delivering their largest sweet zone ever for explosive distance across the face. The largest iron profile Cobra has ever created results in increased Moment of Inertia providing more forgivness to make it easier to hit the center of the clubface more consistently. This helps to generate more ball speed on off center hits for effortless distance. A thinner, stronger face and sole structure re-engineered for speed. The high strength 17-4 stainless steel L-Cup face design produces a larger Sweet Zone delivering distance, more forgiveness and ultra precise irons. This means more ball speed and controlled distance. Full-hollow body construction throughout the set for a soft, yet solid feel combined with Tungsten weighting, these clubs deliver more forgiveness and precision. This perfected CG positioning produces improved consistency and added distance in a higher launching, more powerful feeling iron. Features: PWRShell Face - A thinner, stronger face and sole structure re-engineered for speed. Using a high strength 17-4 stainless steel L-Cup face design. Cobra has produced a larger Sweet Zone delivering distance, more forgiveness and ultra precise irons. Sweet ZoneT - Using a thin, high strength L-Cup face construction allowed Cobra to move the weld out to the topline and down to the sole, creating a Sweet Zone that is 12% larger than their F6 in the mid-irons, 7% larger in the long irons and 5% larger in the wedges. This means more ball speed and controlled distance. Oversized Profile - The largest iron profile Cobra has ever created results in increased Moment of Inertia (MOI) providing more forgivness to make it easier to hit the center of the clubface more consistently. This helps to generate more ball speed on off center hits for effortless distance. Centered CG - Using a full hollow body construction combined with Tungsten weighting, Cobra has have positioned the CG lower and centered in the club head to deliver more forgiveness and precision. This perfected CG positioning produces a higher launching, more powerful feeling iron. Full Hollow Body - Full-hollow body construction throughout the set delivers a soft, yet solid feel and helps to lower the CG for improved consistency and added distance. Multi-Material T.O.P. Technology Cavity Construction - Thin, optimized and personalized weight savings with the new polymer medallion badge allow the CG to be moved lower to create more distance and forgiveness. Tungsten Toe Weighting - High density tungsten weight is strategically positioned low on the toe of the club head for a covered and centered CG for more precision and easy-up distance. Progressive Spin Technology - V-Grooves on the 4-6 irons to reduce spin, U-Grooves on the 7-PW to optimize spin, and wedge-spaced grooves on the GW-SW to produce extra spin for shots around the green. Premium Chrome Finish - Nickel chrome p