Abstract: A wood-style golf club head having a variable thickness face, a plurality of linear face markings including at least one above and below face center, and face permanent indicia including at least two letters located at least partially on a face toe portion of the face, along with unique relationships to emphasize the contrast of some elements and reduce the contrast of other elements, including a significant contrast between the linear face markings and the face, and a controlled contrast between the face and the face permanent indicia.

Abstract: A wood-style golf club head having a variable thickness face, a plurality of linear face markings including at least one above and below face center, and face permanent indicia including at least two letters located at least partially on a face toe portion of the face, along with unique relationships to emphasize the contrast of some elements and reduce the contrast of other elements, including a significant contrast between the linear face markings and the face, and a controlled contrast between the face and the face permanent indicia.

Abstract: A wood-style golf club head having a variable thickness face, a plurality of linear face markings, and face permanent indicia, along with unique relationships to emphasize the contrast of some elements and reduce the contrast of other elements.

Abstract: A method of measuring and recording at least one performance variable of a golf club head.

Abstract: A method of measuring and recording at least one performance variable of a golf club head.

Abstract: A method of measuring, recording, and mapping at least one performance variable of a face of a golf club head.

Abstract: A method of measuring, recording, and mapping at least one performance variable of a face of a golf club head.

Abstract: A golf club head having a face with a face center and a center face measured performance variable, which may be a characteristic time, or CT, value, a coefficient of restitution, or COR, value, or a potential smash factor. The face includes a center face permanent indicia that is indicative of the center face measured performance variable. Relationships among the permanent indicia and the face are disclosed to reduce the likelihood of distraction caused by the permanent indicia as a golfer addresses a shot. Further, the surface roughness of the permanent indicia is controlled with respect to the surface roughness of the face to reduce the impact that the permanent indicia has on the performance of the golf club head.

Abstract: A golf club head having a face with a face center and a center face measured performance variable, which may be a characteristic time, or CT, value, a coefficient of restitution, or COR, value, or a potential smash factor. The face includes a center face permanent indicia that is indicative of the center face measured performance variable. Relationships among the permanent indicia and the face are disclosed to reduce the likelihood of distraction caused by the permanent indicia as a golfer addresses a shot. Further, the surface roughness of the permanent indicia is controlled with respect to the surface roughness of the face to reduce the impact that the permanent indicia has on the performance of the golf club head.