Provided is a playing device which includes a spherical playing device body having a hollow interior, having a plurality of emission holes and one coupling hole on a surface thereof, and configured to be rolled and rotated by a pet, a core coupled to the interior of the playing device body through the coupling hole and having a plurality of vent holes on a surface thereof, a melody generating unit installed in the interior of the core and configured to generate a melody when the playing device is rolled and rotated, a light generating unit installed in the interior of the core and configured to generate light when the playing device is rolled and rotated, and a control unit installed in the interior of the core and configured to detect an impact generated when the playing device is rotated to operate the melody generating unit and the light generating unit.

A polyurethane coating for a golf ball that is based on polyol mixture containing acrylic polyol and BEPD based caprolcatone polyol is disclosed herein. The polyurethane coating comprises a part A component and a part B component, with the part A component comprising an acrylic polyol, a BEPD polyol, a 3-Oxazolidineethanol, a fluorosurfactant, a hindered amine light stabilizer, a UV-absorber, an optical brightener, a dibutyltin dilaurate catalyst, and an organic solvent, and the part B component comprising an aliphatic polyisocyanate and an organic solvent.

A polyurethane coating for a golf ball that is based on polyol mixture containing acrylic polyol and BEPD based caprolcatone polyol is disclosed herein. The polyurethane coating comprises a part A component and a part B component, with the part A component comprising an acrylic polyol, a BEPD polyol, a 3-Oxazolidineethanol, a fluorosurfactant, a hindered amine light stabilizer, a UV-absorber, an optical brightener, a dibutyltin dilaurate catalyst, and an organic solvent, and the part B component comprising an aliphatic polyisocyanate and an organic solvent.

The present invention is a golf ball which comprises dimples having a cross section defined by the superposition of two or more continuous and differentiable functions, and particularly the superposition of a catenary function and a Witch of Agnesi function. Additionally, the dimples preferably have a circular boundary and maintain an axis coincident with the center of the circular boundary.

A golf ball 2 includes a core 4, a cover 8 positioned outside the core 4, and a paint film 10 positioned outside the cover 8. The paint film 10 includes an inner layer 12 and an outer layer 14 positioned outside the inner layer 12. A 10% modulus Mo of the outer layer 14 is lower than a 10% modulus Mi of the inner layer 12. A difference (Mi-Mo) between the modulus Mi and the modulus Mo is not less than 25.0 kgf/cm.sup.2. The cover 8 has a Shore D hardness Hc of not less than 50 and not greater than 65. The cover 8 has a thickness Tc of not less than 0.80 mm and not greater than 1.80 mm.

A game ball including a leather cover secured about a solid core, wherein the leather cover includes an inner surface contacting the solid core and an opposing outer surface and wherein the game ball is characterized by including polyacrylate particles dispersed on but not encased about the outer surface of the leather cover.

A game ball including a leather cover secured about a solid core, wherein the leather cover includes an inner surface contacting the solid core and an opposing outer surface and wherein the game ball is characterized by including polyacrylate particles dispersed on but not encased about the outer surface of the leather cover.

A colored golf ball has improved luxurious appearance without impairing its visibility. The colored golf ball of the present invention includes a core; a cover placed around the core having dimples formed on its surface; and a coating layer placed on top of the cover, in which the coating layer includes a polymer matrix having a bright material dispersed therein, and an L.sub.0 value, which represents an L value in the Lab color system of the colored golf ball before being covered with the coating layer, is 25 or less, and the difference L between the L.sub.0 value and an L.sub.1 value, which represents an L value in the Lab color system of the colored golf ball after being covered with the coating layer, is 5 or more.

The present invention relates to the use of a mono (meth)acrylate ester in a golf ball layer. The mono (meth)acrylate ester may be added to one or more portions of a golf ball including a core, intermediate, or cover layer. For example, in one embodiment, the mono (meth)acrylate ester may be blended with a polybutadiene rubber material. In another embodiment, the mono (meth)acrylate ester of the present invention may be blended with an ionomer. In some embodiments, the mono (meth)acrylate ester may be blended with a formulation including both a polybutadiene rubber component and an ionomer.

A baseball and a method of instructing throwing a baseball is disclosed. The baseball has a seam, a first, preferably green, color zone placed on a first side of the ball, a second, preferably yellow color zone placed around a first circumference of the ball, and a third, preferably red, color zone placed on a second side of the ball. A pair of finger placement markings are carried on the first color zone. The baseball player is instructed to engage in a proper throwing motion, and the ball confirms by maintaining visual line of sight with the first color zone throughout, providing feedback of a correct throwing motion in which the ball is drawn. away from the target with the arm and hand placed in a correct position.