The Callaway X-22 irons features the following:Precision Notch Weighting precisely moves weight to the perimeter toward the heel and toe to create a higher Moment of Inertia for greater forgiveness and stability on off center hits. A Tour Inspired club head shape is incorporated to assist in increasing the Moment of Inertia with a thinner top line and narrower sole. A polycarbonate tip plug in the Modified Tru Bore design dampens vibration for enhanced performance and feel. Forgiveness and distance is further maximized with Variable Face Thickness Technology.