The invention relates to a frame for a ball game racket comprising a handle region and a head region with a bridge, wherein a part of the head region and/or the handle region comprise(s) a carbon fiber composite material and wherein the bridge comprises magnesium and is formed as one part.

A tennis racket includes throats. Each throat includes a fiber reinforced layer and a vibration damper. The vibration damper is surrounded by the fiber reinforced layer. The fiber reinforced layer includes a plurality of reinforcement fibers and a matrix. The reinforcement fibers are typically carbon fibers. The material of the matrix is a resin composition whose base material is an epoxy resin. The vibration damper is formed of a polymer composition. The polymer composition contains a base polymer. The base polymer is preferably a styrene-isoprene-styrene block copolymer or an acrylic elastomer.

Repulsive-performance upon ball hitting with a racket is enhanced, and good feeling of ball hitting is ensured. A grommet includes a cylindrical part which is mounted pierced through a through hole formed in a frame of a racket and through which a string passes. The string is extended in a tensioned state on the frame and deflected with one end side of the cylindrical part as a deflection position. The cylindrical part includes a first formation section located on a deflection-position side with reference to a central axis position of an outer peripheral face of the cylindrical part and a second formation section located on an opposite side of the central axis position from the first formation section. The first formation section has a greater thickness than the second formation section in a radial direction of the cylindrical part.

Repulsive-performance upon ball hitting with a racket is enhanced, and good feeling of ball hitting is ensured. A grommet includes a cylindrical part which is mounted pierced through a through hole formed in a frame of a racket and through which a string passes. The string is extended in a tensioned state on the frame and deflected with one end side of the cylindrical part as a deflection position. The cylindrical part includes a first formation section located on a deflection-position side with reference to a central axis position of an outer peripheral face of the cylindrical part and a second formation section located on an opposite side of the central axis position from the first formation section. The first formation section has a greater thickness than the second formation section in a radial direction of the cylindrical part.

Structures with racket performance varied according to the configurations of cylindrical parts can be easily used. A grommet (25-28) includes a cylindrical part (32) which is mounted pierced through a through hole (23) formed in a frame (20) of a racket (10) and through which a string (21) passes. The string is extended in a tensioned state on the frame so as to form front and back faces as hitting faces (22). The cylindrical part includes a first formation section (35) forming both sides of a central axis position (C) of the cylindrical part and a second formation section (36) rotationally shifted with reference to the central axis position by 90 degrees relative to the first formation section and forming both sides of the central axis position. One of the first and second formation sections is disposed on both sides in a front/back direction. The first and second formation sections each have a different rigidity.

Structures with racket performance varied according to the configurations of cylindrical parts can be easily used. A grommet (25-28) includes a cylindrical part (32) which is mounted pierced through a through hole (23) formed in a frame (20) of a racket (10) and through which a string (21) passes. The string is extended in a tensioned state on the frame so as to form front and back faces as hitting faces (22). The cylindrical part includes a first formation section (35) forming both sides of a central axis position (C) of the cylindrical part and a second formation section (36) rotationally shifted with reference to the central axis position by 90 degrees relative to the first formation section and forming both sides of the central axis position. One of the first and second formation sections is disposed on both sides in a front/back direction. The first and second formation sections each have a different rigidity.

A grommet of a racket includes a tubular portion. The tubular portion has a through hole through which a string is passed. The through hole has a base-side opening, a side wall, and a tip-side opening. In the tip-side opening, an inner dimension in a direction parallel to a face is larger than an inner dimension in a direction perpendicular to the face. In the tubular portion, the string is in contact with the side wall from the base-side opening to the tip-side opening.

A grommet of a racket includes a tubular portion. The tubular portion has a through hole through which a string is passed. The through hole has a base-side opening, a side wall, and a tip-side opening. In the tip-side opening, an inner dimension in a direction parallel to a face is larger than an inner dimension in a direction perpendicular to the face. In the tubular portion, the string is in contact with the side wall from the base-side opening to the tip-side opening.

A racket shock-absorbing device comprises: a lower hard seat member, disposed at a periphery of a racket frame of a racket and arranged between two single grommets respectively formed with a string hole allowing a string to be disposed, and a top end thereof is disposed with one or more than two protrusions, and the lower hard seat member is formed with a recess; at least one upper soft pad member, disposed on a top end of the lower hard seat member, wherein one or more than two buckle slots is disposed inside the upper soft pad member and arranged correspondingly to the one or more than two protrusions of the lower hard seat member, the string is crossly disposed and downwardly pressed at a top end defined at a center of the upper soft pad member and arranged correspondingly to the recess of the lower hard seat member.

A racket shock-absorbing device comprises: a lower hard seat member, disposed at a periphery of a racket frame of a racket and arranged between two single grommets respectively formed with a string hole allowing a string to be disposed, and a top end thereof is disposed with one or more than two protrusions, and the lower hard seat member is formed with a recess; at least one upper soft pad member, disposed on a top end of the lower hard seat member, wherein one or more than two buckle slots is disposed inside the upper soft pad member and arranged correspondingly to the one or more than two protrusions of the lower hard seat member, the string is crossly disposed and downwardly pressed at a top end defined at a center of the upper soft pad member and arranged correspondingly to the recess of the lower hard seat member.