Patent ID: 8241148

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 60 Shore D or less; 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 45 Shore C or greater; and an inner cover layer having a surface hardness of 70 Shore D or less; and an outer cover layer having a surface hardness of from 30 Shore D to 60 Shore D; wherein each of the core layers has a specific gravity of 1.25 g/cc or less.