Patent ID: 7648427

Claim:
A golf ball, comprising: a core, and a cover positioned outside the core, wherein said core has a center and a mid layer positioned outside the center, and wherein: the base polymer of the center includes a thermoplastic elastomer as a principal component, the center has a diameter of 19 mm or greater and 35 mm or less, the center has a Shore D hardness H 1 of equal to or less than 25, the center has an amount of compressive deformation of 5.0 mm or greater and 10.0 mm or less, as measured with an initial load of 1 kgf and a final load of 10 kgf, the difference (H 2 −H 1 ) between the surface hardness H 2 of the core and the hardness H 1 of the center is 25 or greater and 60 or less, and wherein the difference (H 3 −H 1 ) between the hardness H 3 of the cover and the hardness H 1 of the center is 40 or greater and 65 or less.