Abstract: This invention provides a golf club head that is made with simple structure and can be changed of its total shape and mounting position of a golf club shaft by partly replacing its parts. Therefore it is superior in flexibility of choosing its shape, and in versatility. Since the golf club head can commonize many parts, inventory control will be easy, and is superior in mass productivity. Further, beginner and amateur players can easily customize the center of gravity position depending on their preference. Therefore, they can use the golf club head for a long term. Further, it is superior in maintenance characteristics, the handling characteristics, and the resource saving characteristics. It contributes to not only the golf population but also, resources-saving and environmental protection.

Abstract: A golf club includes a golf club head including a golf club head including a head body and a pair of balance adjustment portions formed in the head body, a plurality of weights detachably retained in each balance adjustment portion so that a three-dimensional gravity center position of the golf club head is adjusted, the weights serving as balancers and differing from each other in density and mass, and an IC chip accommodating portion which is formed in the head body or one of the balance adjustment portions to house an IC chip which stores information on a three-dimensional gravity center position of the golf club head.

Abstract: A golf club includes a golf club head including a golf club head including a head body and a pair of balance adjustment portions formed in the head body, a plurality of weights detachably retained in each balance adjustment portion so that a three-dimensional gravity center position of the golf club head is adjusted, the weights serving as balancers and differing from each other in density and mass, and an IC chip accommodating portion which is formed in the head body or one of the balance adjustment portions to house an IC chip which stores information on a three-dimensional gravity center position of the golf club head.

Abstract: Golf clubs and golf club sets which include weights which control the effective loft angles of the club head. Weights positioned adjacent the top of the club heads between the face and bottom focus the mass of the club head to improve striking force or power imparted to a ball upon impact. Weights positioned adjacent the face of the club heads between the bottom and top create moments of inertia which effect the loft angle of the club faces when a ball is struck by the clubs. These two types of weight positions can be combined together.

Abstract: Golf clubs and golf club sets which include weights which control the effective loft angles of the club head. Weights positioned adjacent the top of the club heads between the face and bottom focus the mass of the club head to improve striking force or power imparted to a ball upon impact. Weights positioned adjacent the face of the club heads between the bottom and top create moments of inertia which effect the loft angle of the club faces when a ball is struck by the clubs. These two types of weight positions can be combined together.

Abstract: A golf club set in which the weight balance of club shafts is optimized for each individual club. The weight balance at the grip-end of the shaft of each of the individual golf clubs increases as the corresponding loft angles of each of the individual golf clubs increase.

Abstract: A golf club set in which the attenuation rate of torque oscillation of club shafts is optimized for every individual club. The attenuation rate of torque oscillation of club shafts is controlled so as to be larger as the corresponding loft angles of the clubs increase.

Abstract: A golf club set in which the attenuation rate of torque oscillation of club shafts is optimized for every individual club. The attenuation rate of torque oscillation of club shafts is controlled so as to be larger as the corresponding loft angles of the clubs increase.

Abstract: A golf club set in which the weight balance of club shafts is optimized for each individual club. The weight balance at the grip-end of the shaft of each of the individual golf clubs increases as the corresponding loft angles of each of the individual golf clubs increase.