From Golf Magazine (Buyer's Guide, May 2009)
Jeff Colton, Senior VP, R&D, Callaway Golf: "We believe X Series irons are worthy of 'dynasty' status in the industry. In creating the successor to X-20, our best selling X-iron, we look for every opportunity for improvement. But we are mindful not to sacrifice what led to its remarkable success: performance, feel and aesthetics."
How it works: The sixth iteration, the X-22, has a thinner topline and narrower sole than the X-20. This unites with a bigger, wider cavity "notch" that shifts more discretionary weight to the heel or toe. The by-product is a 10 percent higher MOI and greater head stability. An "undercut channel" behind the face pulls mass rearward to increase overall forgiveness and to promote repeatable flight. Varying the face thickness bolsters ball speed (distance) on mis-hits. A polycarbonate plug in the shaft tip (hidden from view) should dampen vibration.