| 摘要 |
A golf ball including an inner core having a first outer surface and a geometric center is formed from a substantially homogenous formulation such that the inner core generally has a hardness of 35 Shore C to 85 Shore C. An outer core layer is formed around the inner core and has a second outer surface and an inner surface, also formed from a substantially homogenous formulation, such that the outer core layer has a hardness of 55 Shore C to 90 Shore C. A cover layer is disposed about the outer core layer. The hardness of the first outer surface is greater than the hardness of the geometric center to define a "positive hardness gradient," and the hardness of the second outer surface is substantially the same as or lower than the hardness of the inner surface to define a "negative hardness gradient."
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