Adams Golf Redline 3-4H 5-PW Irons - Set of 8 Clubs By combining a larger hybrid head, an ultra-thin steel face and longer shaft length, the Redline Super Hybrids deliver faster ball speeds and more distance than traditional hybrids. The Redline irons have been engineered to take the best attributes of hybrid design and apply them to the irons in order to increase distance. A tri-level sole design reduces turf interference for ease of play from the tee, fairway or rough and 45 grams of mass placed low and back improves forgiveness. A more satisfying feel and sound comes from Thermoplastic Polyurethane (TPU) inserts. Each iron in the Redline set has also been individually optimized to work together and outperform traditional irons. With progressive topline thickness and increased sole camber throughout, each iron is fully integrated with the next to maximize performance.