| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a high restitution coefficient, controlled moment of inertia and a high spin velocity at a short shot. SOLUTION: The golf ball is structured so as to be comprised of a solid core and a cover surrounding the core. In such case, the core contains a central core layer and an outside core layer surrounding the central core layer, the central core layer has a specific gravity significantly differing from the outside core layer by more than 0.1, and the cover contains an inside cover layer formed by covering the core and an outside cover layer surrounding the inside cover layer, and the Shore D hardness of the outside cover layer is lower than the inside core layer and 55 or lower.</p> |
