Solid golf ball

A solid golf ball comprising:

• a solid core and a cover that encloses the solid core, the solid core having a multiplayer construction which includes a center core and outer core that encloses the center core, wherein
• the center core is composed primarily of a resin and has a diameter d and a specific gravity G which satisfy the relationships (i)-(ii):
• (i)3≦d(mm)≦13,
• and
• (ii)[G≧](0.014d+0.929)≦G≦1.5,
• the center core has a Shore D hardness of 40 to 95 at the surface thereon,
• the outer core has a Shore D hardness at the inner most layer thereof which is composed primarily of a resin or a resin and rubber mixture which is at least 10 units lower than the Shore D hardness at the surface of the center core, and
• the solid core has a deflection of 2.2 to 4.3 mm under an applied load of 100kg.

A solid golf ball comprising:

• a solid core and cover that encloses the solid core;
• the solid core having a multiplayer construction which includes a center core and an outer core that encloses the center core, wherein
• the center core is composed primarily of a resin which is added with an inorganic filler and has a diameter d and a specific gravity G which satisfy the relationship (i)-(ii):
• (i)3≦d(mm)≦13,
• and
• (ii)[G≧](0.014+0.929)≦G≦1.5
• the center core has a Shore D hardness of 40 to 95 at the surface thereon, and
• the outer core has a Shore D hardness at an innermost layer thereof which is composed primarily of a resin or a resin and rubber mixture which is at least 10 units lower than the Shore D hardness at the surface of the center core.

A solid golf ball comprising:

• a solid core and a cover that encloses the solid core, the solid core having a multilayer construction which includes a center core and an outer core that encloses the center core, wherein
• the center core is composed primarily of a resin and has a diameter d and a specific gravity G which satisfy the relationships (i)-(ii):
• (i)3≦d(mm)≦13,
• and
• (ii)(0.014d+0.929)≦G≦1.5
• the center core has a Shore D hardness of 40 to 95 at the surface thereon,
• the outer core has a Shore D hardness at an innermost layer thereof which is composed primarily of a resin or a resin and rubber mixture which is at least 10 units lower than the Shore D hardness at the surface of the center core, and
• the golf ball an a whole has a defection in the range of 2.2 to 3.8 mm under an static load of 100 kg.

A solid golf ball comprising:

• a solid core and a cover that encloses the solid core, the solid core having a multiplayer construction which includes a center core and an outer core that encloses the center core, wherein
• the center core is composed primarily of a resin and has a diameter d and a specific gravity G which satisfy the relationships (i)-(ii):
• (i)3≦d(mm)≦13,
• and
• (ii)(0.014d+0.929)≦G≦1.5
• the center core has a Shore D hardness of 40 to 95 at the surface thereon, and
• the outer core has a Shore D hardness at an innermost layer thereof which is formed if a rubber base material which is at least 10 units lower than the Shore D hardness at the surface of the center core.