Patent ID: 8110060

Claim:
A method, comprising: attaching a sole preform to a face plate using an adhesive; attaching a crown preform to the face plate and the sole preform using an adhesive; attaching a weighted member preform to at least one of the crown preform or the sole preform; and forming the crown preform, the sole preform, and the face plate into a golf club head structure, wherein the crown preform is formed so as to include a low rigidity portion extending from a vicinity of the face plate toward a rearmost portion of the golf club head, wherein the low rigidity portion has a width that becomes gradually narrower as it extends toward the rearmost portion and is constructed and arranged to transmit a deformation wave generated in the crown when the golf club strikes a ball along the low rigidity portion to a weighted member of the weighted member preform and back toward the face plate from the weighted member along the low rigidity portion, wherein the low rigidity portion is provided on a convex portion of the crown so as to protrude from a main surface of the crown.