Patent ID: 7097572
Filing Date: 2006-08-29
Classification: A63B

Abstract:
1. A hollow metal club head comprising a face portion whose front surface defines a club face for hitting a ball, and a turnback wall extending backward from a circumferential edge of the face portion, wherein a head volume is in a range of not less than 440 cc, a height of the club face is in a range of from 55 to 85 mm, a surface area of the club face is in a range of from 4000 to 6500 sq.mm, and in a front end zone of the turnback wall and a peripheral zone of the face portion which are adjacent to each other through a junction between the turnback wall and the face portion, the ratio Rf/Rh of a zone rigidity Rf of the peripheral zone to a zone rigidity Rh of the front end zone is in a range of from 4.0 to 12.0, wherein