The Acer XF is our latest generation of game-improvement irons to replace our ever-popular Acer XK line that was named Golf Digest's 2009 Best Value iron. More chiseled than its predecessor to garner more a dramatic appearance, we were able to push the center of gravity even deeper (1.4mm) and lower (0.2mm) for improved performance. Another way to put it is the XF stands for extra forgiveness. The non-glare topline has been beveled to provide a less chunky appear at address. The higher launching XF High Trajectory is designed for higher handicappers with a lower center of gravity design.