Patent ID: 8616999

Claim:
A golf club head comprising: a club head body having an external surface with a heel portion, a toe portion, a crown, a sole, and a face; a moment of inertia about the CG Z axis, I zz ; and a moment of inertia about the CG X axis, I xx , wherein I xx is at least about 3000 gÂ·cm 2 and wherein I zz is greater than I xx ; wherein the face includes: a front side and a back side that define a variable face thickness; a bulge curvature and a roll curvature; and wherein a ratio of bulge curvature divided by roll curvature, R C , satisfies the following: 1 3.3 â¢ x â¢ â¢ 10 - 4 * I ZZ + 0.9154 â‰¤ R C â‰¤ 1 1.7 â¢ x â¢ â¢ 10 - 4 * I ZZ + 0.4574 .