Patent ID: 7976411

Claim:
A golf ball comprising: a center formed from a first thermoset rubber composition and having a diameter of from 1.250 inches to 1.580 inches, a center hardness of from 40 Shore C to 90 Shore C, and a surface hardness of from 50 Shore C to 95 Shore C; an intermediate core layer formed from a thermoplastic composition and having a thickness of 0.005 inches to 0.100 inches and a surface hardness of greater than 60 Shore D; an outer core layer formed from a second thermoset rubber composition and having a thickness of 0.010 inches to 0.100 inches and a surface hardness of 50 Shore C or greater; and a cover layer having a thickness of from 0.010 inches to 0.050 inches and a surface hardness of 60 Shore D or less; wherein the specific gravity of at least one of the center, intermediate core layer, and outer core layer is less than 1.05 g/cc.