Provided is a racket frame on which design change can be easily performed by simple processing. The racket frame includes a head formed in a ring shape along a face. On the head, a gut groove in which a base portion for connecting grommets is to be inserted is formed in a radially outer region of the head so as to be recessed toward a radially inner side, and a deformation promotion groove is formed in the radially outer region of the head so as to be recessed toward the radially inner side.

A paddle head guard system may include a paddle head guard sized to at least partially cover an outer edge portion of a paddle head. The guard may include a moldable and hardenable band configured to be hardened after being wrapped over the outer edge portion of the paddle head.

To enhance a resilience performance of a ball at hitting the ball, a grommet is configured to include a strip-shaped portion extending in a predetermined direction and a cylindrical portion projecting from one surface of the strip-shaped portion, the cylindrical portion being a portion through which a string passes. A bulge portion is formed on a part on another surface of the strip-shaped portion, the part being along an inner periphery of the cylindrical portion. The bulge portion has a shape bulged more than the other surface of the strip-shaped portion, and the string is folded back at the bulge portion. A plurality of the protrusions are formed between the cylindrical portions adjacent to one another, the plurality of the protrusions being portions to which the string contacts.

Disclosed is a tennis racket including: an oval frame adapted to support a latticework, and through-bands for the strands of latticework cord, each band being received in an outer housing in the frame and including through-tubes for the strands, the tubes being inserted in the direction of the interior of the frame in through-holes provided in the frame. Each band is arranged flush with the outer edge of the cross-section of the frame, and an outer shell of the cross-section of the frame is essentially diamond shaped.

Disclosed is a tennis racket including: an oval frame adapted to support a latticework, and through-bands for the strands of latticework cord, each band being received in an outer housing in the frame and including through-tubes for the strands, the tubes being inserted in the direction of the interior of the frame in through-holes provided in the frame. Each band is arranged flush with the outer edge of the cross-section of the frame, and an outer shell of the cross-section of the frame is essentially diamond shaped.

Provided is a racket frame on which design change can be easily performed by simple processing. The racket frame includes a head formed in a ring shape along a face. On the head, a gut groove in which a base portion for connecting grommets is to be inserted is formed in a radially outer region of the head so as to be recessed toward a radially inner side, and a deformation promotion groove is formed in the radially outer region of the head so as to be recessed toward the radially inner side.

Provided is a racket frame on which design change can be easily performed by simple processing. The racket frame includes a head formed in a ring shape along a face. On the head, a gut groove in which a base portion for connecting grommets is to be inserted is formed in a radially outer region of the head so as to be recessed toward a radially inner side, and a deformation promotion groove is formed in the radially outer region of the head so as to be recessed toward the radially inner side.

A composite material body (10) includes a first material layer (20) and a second material layer (30) overlapping the first material layer (20). The first material layer (20) and the second material layer (30) are wound to form a flexible and circular rod. Impact absorption is effectively improved and impact resisting strength is enhanced because energy-absorber or damping material or its composition is attached into the composite material body (10). Technical characteristics, effects and objects of this invention are achieved thereby.

In an example, a paddle bumper may include a band configured to extend around and at least partially encase at least a portion of a lateral edge of a paddle. The band includes a first portion, a second portion, and a handle portion. The handle portion includes an aperture, a first lateral side, and a second lateral side opposite the first lateral side. The first portion of the band connects to the first lateral side and the second portion of the band connects to the second lateral side.

A sports product may include a support member and an impact region configured to impact an object. The impact region may be coupled to the support member. The sports product may also include a shear thickening material in at least one of the support member or the impact region. The shear thickening material may be configured to exhibit shear thickening behavior when an impact occurs between the impact region and the object.