Patent ID: 7169059

Claim:
A golf club head comprising a hitting face wherein the hitting face comprises an elliptical inner zone having a first flexural stiffness and a first major axis, and at least a concentric intermediate zone having a second flexural stiffness, wherein the first flexural stiffness is higher than the second flexural stiffness wherein the first major axis of the elliptical inner zone forms a first angle from about 10° to about 60° with a shaft axis of the club head, wherein a center of gravity of the golf club head is located about ±0.050 inch on an X-axis and about −0.050 inch to about −0.150 inch on a Z-axis and about 2.0 inch on a Y-axis with respect to a geometric center of the hitting face, wherein the X-axis is defined as a horizontal axis tangent to a geometric center of the hitting face with the positive direction toward the heel of the club head, the Y-axis is a horizontal axis orthogonal to the X-axis with the positive direction toward the rear of the club head and the Z-axis is orthogonal to both the X- and Y-axes with the positive direction toward the crown of the club head, and wherein the three axes intersect at the geometric center of the hitting face.