| 摘要 |
<p>PROBLEM TO BE SOLVED: To largely increase flying distance, and provide favorable striking feel regardness of a head speed by optimizing hardness balance of a core, a middle layer, and a cover, and setting dimple elements to be correct. SOLUTION: In a golf ball comprising a solid core 2, a middle layer 3, and a cover 4, with a number if dimples formed in the surface of the cover 4, a surface hardness of the core 2 is 48 or less by the shore hardness, a hardness of the middle layer 3 is 53 or more and 60 or less by the shore hardness, and more than the surface hardness of the core 2 by 8 or more, a hardness of the cover 4 is 55 or more and 65 or less by the shore hardness, and more than the hardness of the middle layer 3, the dimples comprise at least two sorts of different diameters and/or depths, a total number of the dimples is 370-450 a dimple surface rate is 63% or more, and a dimple total surface index Dst value is 4 or more.</p> |
