An object of the present invention is to provide a golf ball having excellent shot feeling on driver shots. The present invention provides a golf ball comprising a core and at least one cover covering the core, wherein a material for forming the core has a loss tangent difference tan (tan .sub.80tan .sub.40) of 0.12 or more between a loss tangent tan .sub.80 at 80 C. and a loss tangent tan .sub.40 at 40 C.

A golf ball includes a main body and a paint layer positioned outside the main body. The paint layer includes an inner layer and an outer layer positioned outside the inner layer. When an indentation depth (nm) is measured on a cross-section along a plane passing through a central point of the golf ball when a force of 30 mgf is applied to the cross-section in a direction perpendicular to the cross-section, an indentation depth Di on a cross-section of the inner layer is smaller than an indentation depth Do on a cross-section of the outer layer. A thickness To of the outer layer is larger than a thickness Ti of the inner layer.

A rubber composition for golf balls includes (a) a base rubber, (b) a co-crosslinking agent which is an ,-unsaturated carboxylic acid and/or a metal salt thereof, (c) an organic peroxide, (d) water or an alcohol, and (e) an antioxidant which is a benzoimidazole of the following general formula and/or a metal salt thereof. When the rubber composition is used in constituent members of a golf ball, especially the core, the golf ball exhibits low spin properties on shots, resulting in an improved flight performance and enabling a good durability to be maintained.

A golf ball 2 includes a main body 4 and a paint layer 6 positioned outside the main body 4. The main body 4 includes a spherical core 8, a mid layer 10 positioned outside the core 8, and a cover 12 positioned outside the mid layer 10. The paint layer 6 includes an inner layer 14 and an outer layer 16 positioned outside the inner layer 14. When an indentation depth (nm) is measured on a cross-section along a plane passing through a central point of the golf ball 2 when a force of 30 mgf is applied to the cross-section in a direction perpendicular to the cross-section, an indentation depth Di on a cross-section of the inner layer 14 is lower than an indentation depth Do on a cross-section of the outer layer 16.

Systems and methods for tracking a sports object are provided. A sports object includes a core assembly arranged within a shell and having multiple components to receive and transmit signals corresponding to movement of the sports object, as well as to support operational tracking of the sports object. The core assembly includes a multi-layer printed circuit board (PCB) comprised of a plurality of sections. The PCB is configured to at least partially envelope the energy storage device at a geometric center of the assembly. The PCB is connected to one or more antennas (e.g., via one or more contacts), which may be arranged on one or more sections of the PCB, arranged on a surface of the shell, and/or in a volume within the shell.

Systems and methods for tracking a sports object are provided. A sports object includes a core assembly arranged within a shell and having multiple components to receive and transmit signals corresponding to movement of the sports object, as well as to support operational tracking of the sports object. The core assembly includes a multi-layer printed circuit board (PCB) comprised of a plurality of sections. The PCB is configured to at least partially envelope the energy storage device at a geometric center of the assembly. The PCB is connected to one or more antennas (e.g., via one or more contacts), which may be arranged on one or more sections of the PCB, arranged on a surface of the shell, and/or in a volume within the shell

Systems and methods for tracking a sports object are provided. A sports object includes a core assembly arranged within a shell and having multiple components to receive and transmit signals corresponding to movement of the sports object, as well as to support operational tracking of the sports object. The core assembly includes a multi-layer printed circuit board (PCB) comprised of a plurality of sections. The PCB is configured to at least partially envelope the energy storage device at a geometric center of the assembly. The PCB is connected to one or more antennas (e.g., via one or more contacts), which may be arranged on one or more sections of the PCB, arranged on a surface of the shell, and/or in a volume within the shell.