The Cobra S3 Iron Set has E9 Face Technology and multi-material design, which combine to optimize all-around performance in each individual iron of this set. E9 Face Technology is a new, advanced system that creates a larger sweet zone for increased distance and accuracy. A progressive cavity design, which has a new back-cavity shape and optimized face thickness design, progresses from elliptical (long-irons) to circular (short-irons) to optimize distance and feel based on typical golfer impact patterns. A special high-strength composition of steel and alloy in the long- and mid-irons allows for a thinner, hotter face, increasing coefficient of restitution and ball speed. A new hidden internal polymer topline and full cavity TPU (thermoplastic urethane) combine to optimize weight distribution and dampen vibration for superior feel and distance. A stepped crescent sole design narrows in the toe and heel to provide superior turf interaction, promoting more consistent distance and accuracy. The Baffler-style hybrids in this iron-hybrid set promotes more forgiveness and a higher ball flight than standard long-irons and provide more consistency and versatility.