Patent ID: 6960142

Claim:
A golf club head adapted for attachment to a shaft comprising: a face having a total face area and a first primary resonant frequency less than about 2900 Hz, the face comprising: a central zone having a first perimeter and a first flexural stiffness, wherein the central zone comprises between 15% and 60% of the total face area, and wherein the central zone includes a geometric center of the face; an intermediate zone surrounding the first perimeter of the central zone, the intermediate zone having a second flexural stiffness, wherein the first flexural stiffness of the central zone is at least 25,000 lb-in and greater than the second flexural stiffness of the intermediate zone; and a perimeter zone around the intermediate zone, wherein the area of the perimeter zone is up to 30% of the total face area. wherein the face exhibits a coefficient of restitution greater than or equal to 0.81.