| 主权项 |
1. A golf ball, comprising:
a core center comprising a first thermoplastic material, wherein the core center has a diameter of from about 21 mm to about 29 mm and a surface hardness H1 of more than about 50 Shore D; a core layer disposed radially outward from the core center, wherein the core layer has a thickness of at least about 5 mm, a surface hardness H2 of less than 60 Shore D, and comprises a second thermoplastic material; a cover disposed radially outward of the core layer, wherein the cover comprises a third thermoplastic material and has a surface hardness H3 of at least 60 Shore D;wherein the cover surface hardness H3 is up to about 10 Shore D units higher than the core center surface hardness H1, the core center surface hardness H1 is up to about 10 Shore D units higher than the core layer surface hardness H2, and the specific gravity of the core layer is at least 0.1 g/cm3 higher than the specific gravity of the core center. |
