| 摘要 |
The present invention is directed to golf balls having a resilient inner core and outer core made of a material substantially free of fillers. The invention also encompasses golf balls wherein the inner and outer cores are not made of a thermoplastic material. The invention encompasses golf balls having an inner core, an outer core, an inner cover, and an outer cover wherein the inner core has a specific gravity rho12, the outer core has a specific gravity rho14, the inner cover has a specific gravity rho16, and the outer cover has a specific gravity rho18, wherein the relationship between the specific gravities is expressed by the mathematical expression: rho16>=rho18>=rho14>=rho12.
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