The power and performance of the XCG iron are matched only by their unbelievable feel and responsiveness. The new dual-density dampening system (3DS) ensures both the long irons and short irons deliver the feel you expect from an Exotics iron. The key to the 3DS system is the dual-density elastomer technology. The dampening system is softer in the scoring irons (7-SW) to produce a smooth, buttery feel and greater spin. In the mid & long irons, a firmer density promotes greater rebound, added distance and a responsive, solid feel. With the XCG irons, you also get a classic shape that features a thin top-line, progressive offset and a tour heel grind. The heel grind helps reduce turf drag in the rough for consistent contact. 3DS system delivers ideal performance & feel throughout the set The iron's heavy sole lowers the center of gravity for longer, higher shots Tour heel grind helps reduce turf drag in the rough for easier shots