Patent ID: 7857715

Claim:
A golf ball comprising: a dual core comprising: an inner core having a first outer surface and a geometric center and being formed from a first substantially homogenous composition such that the inner core has a hardness of about 40 Shore C to about 80 Shore C; an outer core layer disposed about the inner core having a second outer surface and an inner surface and being formed from a second substantially homogenous composition, different from the first, such that the outer core layer has a hardness of about 60 Shore C to about 90 Shore C; and a cover layer comprising at least two layers disposed about the outer core layer; wherein the geometric center, the first and second outer surfaces, and the inner surface each have a hardness, the hardness of the first outer surface being lower than the hardness of the geometric center to define a negative hardness gradient, and the hardness of the second outer surface being greater than the hardness of the inner surface by about 10 Shore C to about 20 Shore C to define a positive hardness gradient.