| 摘要 |
A multi-layered core golf ball wherein each core layer comprises its own specific hardness gradient in addition to an overall specific hardness gradient from one core layer to the next. The inner and outer core layers comprise a plurality of hardnesses of from about 50 Shore C to about 80 Shore C. The inner core layer comprises a diameter of about 30 mm or lower, the geometric center comprising a hardness different from that of the outer surface to define a positive or negative hardness gradient of about 20 Shore C or lower. The outer core layer comprises a thickness of about 10 mm or lower, the second outer surface hardness being less than that of the inner surface to define a negative hardness gradient of about 15 Shore C or lower. A further outer core layer hardness, disposed in a region extending between about 10% and about 90% of the distance from the inner surface to the second outer surface, is greater than that of the inner and second outer surfaces. Also, the second outer surface hardness is less than that of the geometric center to define a negative hardness gradient of about 15 Shore C or lower.
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