| 摘要 |
A golf ball comprising a core, a cover inner layer and a cover outer layer has a plurality of dimples on the surface. The JIS-C hardness of the ball decreases successively within specific ranges from the cover outer layer to the cover inner layer to the core surface, but is substantially uniform within a central portion of the core. The dimples are of at least three types having different diameters and have an average diameter of 3.3-4.0 mm and an average depth of 0.11-0.17 mm, with the ratio of average diameter to average depth being from 25 to 33. The total number of dimples is from 380 to 450. The ball exhibits a relatively large deflection and a high resilience on impact which enable it to achieve an improved distance, as well as a good feel.
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