The disclosed system can comprise a device that can be used to provide induction heating to one or more golf balls. The disclosed device comprises at least one induction coil and a housing that holds one or more golf balls. In some embodiments, the induction coil can take one or more turns around the housing. The induction coil generates a magnetic field surrounding the golf ball, inducing eddy currents in the central magnetic reactor within the golf ball interior. As a result, the golf ball is quickly, cleanly, and consistently heated without physical contact between the coil and the golf ball.

An object of the present invention is to provide a golf ball having excellent approach spin performance under a dry condition and excellent approach spin performance under a condition that there is grass between the golf ball and the club face. The present invention provides a golf ball comprising a golf ball body and a paint film formed on a surface of the golf ball body, wherein the paint film is composed of at least one layer, and an outermost paint film layer located at the outermost layer of the golf ball contains, as a base resin, a polyurethane obtained by a reaction between (A) a polyisocyanate composition and (B) a polyol composition, and the outermost paint film layer has a dynamic friction coefficient of from 0.75 to 1.5 measured with a dynamic friction tester under specific conditions.

A rubber composition for golf balls includes (a) a base rubber, (b) a co-crosslinking agent which is an α,β-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.

An object of the present invention is to provide a golf ball comprising a paint film having improved abrasion resistance without substantially lowering the spin performance. The present invention provides a golf ball comprising a golf ball body and a paint film formed on a surface of the golf ball body, wherein the paint film contains a resin fine particle in an amount of less than 10 parts by mass with respect to 100 parts by mass of a base resin thereof, the base resin of the paint film is a polyurethane, and the resin fine particle contains a polyrotaxane component having a cyclodextrin, a linear molecule penetrating the cyclic structure of the cyclodextrin in a skewering manner, and a blocking group located at both terminals of the linear molecule to prevent disassociation of the cyclodextrin, wherein at least a part of hydroxyl groups of the cyclodextrin is modified with a caprolactone chain via a OC.sub.3H.sub.6O group.

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 golf ball (20) approaching zero land area is disclosed herein with a plurality of indentations positioned on the lattices of a plurality of multi-faceted polygons. The golf ball (20) has an innersphere with a plurality of lattice members (40). Each of the plurality of lattice members (40) has an apex and the golf ball (20) of the present invention conforms with the 1.68 inches requirement for USGA-approved golf balls.

An object of the present invention is to provide a golf ball having excellent approach spin performance under a dry condition and excellent approach spin performance under a condition that there is grass between the golf ball and the club face. The present invention provides a golf ball comprising a golf ball body and a paint film formed on a surface of the golf ball body, wherein the paint film is composed of at least one layer, and an outermost paint film layer located at the outermost layer of the golf ball contains, as a base resin, a polyurethane obtained by a reaction between (A) a polyisocyanate composition and (B) a polyol composition, and the outermost paint film layer has a dynamic friction coefficient of from 0.75 to 1.5 measured with a dynamic friction tester under specific conditions.

An object of the present invention is to provide a golf ball comprising a paint film having improved abrasion resistance without substantially lowering the spin performance. The present invention provides a golf ball comprising a golf ball body and a paint film formed on a surface of the golf ball body, wherein the paint film contains a resin fine particle in an amount of less than 10 parts by mass with respect to 100 parts by mass of a base resin thereof, the base resin of the paint film is a polyurethane, and the resin fine particle contains a polyrotaxane component having a cyclodextrin, a linear molecule penetrating the cyclic structure of the cyclodextrin in a skewering manner, and a blocking group located at both terminals of the linear molecule to prevent disassociation of the cyclodextrin, wherein at least a part of hydroxyl groups of the cyclodextrin is modified with a caprolactone chain via a OC.sub.3H.sub.6O group.

A golf ball (20) approaching zero land area is disclosed herein with a plurality of multi-faceted polygons and each of the plurality of multi-faceted polygons has a protrusion extending outward from a surface of the multi-faceted polygon. The golf ball (20) has an innersphere with a plurality of lattice members (40). Each of the plurality of lattice members (40) has an apex and the golf ball (20) of the present invention conforms with the 1.68 inches requirement for USGA-approved golf balls.

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 the core is formed from a core rubber composition containing (a) a base rubber containing a polybutadiene, (b) an ,-unsaturated carboxylic acid having 3 to 8 carbon atoms and/or a metal salt thereof as a co-crosslinking agent, (c) a crosslinking initiator, and (d) a terpene-based resin.