Abstract: An improved neck weighting structure for golf club heads includes a neck, a neck weighting and a weight chamber. The neck extends from a shaft mount towards the lower rim of the sole of the golf club head and straddles the lower rim of the sole to reduce the gravitational center of the club head. The neck weighting projects from the neck near the shaft mount to cause the gravitational center to deviate towards the extended line of the head. The weight chamber accommodates weights of various mass for correcting the position of the gravitational center.

Abstract: A tubular hosel of a club head, having an internally and externally recessed middle section formed of a plurality of thick wall portions and thin wall portions alternatively arranged together around the periphery, and a shock absorbing rubber molded on the middle section and filled up through holes on the thin wall portions and covered on the thick wall portions and the thin wall portions in a flush manner.

Abstract: A golf club head including a casing and a neck at one end of the casing for connection of a club shaft, the casing having a front wall of uniform thickness defining a striking surface, a smoothly curved back wall connected to the front wall by a solid bottom wall and defining with the front wall an upwardly back chamber for permitting the center of gravity of the golf club head to be changed vertically by changing the depth of the back chamber and changed horizontally by sloping the bottom side of the back chamber forwards or backwards.

Abstract: A golf club head which has a face panel of uniform thickness, a back defining a hollow space and a space for counterweight, a flange raised from the back and having two different thicknesses respectively surrounding the hollow space and the space for counterweight, a counterweight mounted in the space for counterweight, and a shock absorbing material filled in the hollow space an covered over the counterweight, wherein the location of the counterweight is visually recognized through the thickness difference of the flange.

Abstract: A golf club head having a face of uniform thickness at the front side, a back hole at the back side, an upright flange raised around the back hole and defining with the periphery of the golf club head a groove around the back hole, and at least one counter weight element of uniform specific gravity fastened to the groove to eliminate resonance vibration.