Patent ID: 7285059

Claim:
A golf ball comprising: a thermoplastic inner core having a specific gravity of less than 1.05 g/cc with a compression of greater than 70; an thermoplastic inner casing layer disposed around the inner core, the inner casing layer having a flexural modulus greater than 30,000 psi, a Shore C hardness greater than 80, and a thickness less than about 0.060 inch; an outer core layer encompassing the inner casing layer, the outer core layer having a flexural modulus of less than 30 kpsi, a Shore C hardness less than 80, a specific gravity of less than 1.05 g/cc, and a thickness less than about 0.050 inch; an outer casing layer having a flex modulus greater than 60 kpsi, a thickness less than about 0.030 inch, and a specific gravity greater than 1.25 g/cc; and an outer cover having a hardness of less than 65 Shore D, and a thickness less than 0.040 inch.