| 摘要 |
A hollow golf club head allowing to increase the repulsion and the degree of design freedom, while maintaining the durability. A hollow golf club head having a head body formed from a metal, wherein a hole is formed in the vicinity of the middle of a crown portion in the head body, the hole is closed with a cover member made of a material different from the head body, and the ratio (rhom/rhof) of the specific gravity rhom of the head body and the specific gravity rhof of the cover member is set equal or superior to 1.3. |
