Adams Senior A3 OS 4-SW Iron Set with Graphite: Introducing Boxer Technology, the latest breakthrough in hybrid shaping and performance from the innovation leader, Adams Golf. Golfers will get straighter and longer ball flight with these hybrids thanks to the ultra-high moment of inertia (MOI) — 30 to 70 percent higher than other leading hybrids. A low, deep center of gravity makes for easy-to-hit shots, while the cambered sole helps cut through turf interference to get the ball into the air with a consistent smooth feel on every swing. The maraging steel pull-face delivers Adams's highest hybrid Coefficient of Restitution (COR) for increased ball speed with improved sound. Features 4, 5 and 6 Boxer hybrids designed for maximum forgiveness and performance 7, 8 and 9 irons have a hollow back design with progressive offset transitions Pitching and sand wedges have reshaped cavity backs for maximum forgiveness and playability