Patent ID: 8357056

Claim:
A hollow golf club head for impacting a golf ball comprising: a face end and a tail end; a strike face at the face end; a crown; a sole having a sole length greater than 3.5 inches; a volume greater than 300 cm 3 ; a structural response modifying element comprising a constraining member having a first end proximate the tail end and a second end distal the tail end and spaced from the strike face, the constraining member extending vertically to contact the sole and the crown at locations including the first end and the second end, and extending, in the face-to-tail direction, between 10% and 40% of the sole length, when the club head is oriented in an address position; a forward portion of the head between the constraining member and the strike face; and the head exhibiting a dominant resonant frequency greater than 3000 Hz.