A shock absorbing structure of a racket contains: a head and an absorption member matingly contacting with an internal fence of the head. The absorption member is a hollowly tubular structure and covers the internal fence totally. When the head is made of carbon-fiber composite material, the absorption member is made of any one of Thermoplastic Elastomer (TPE), Thermoplastic Rubber (TPR), rubber, Hydrogel, and Thermoplastic Polyurethane (TPU). When the head is made of metal or aluminum alloy, the absorption member is made of any one of Thermosetting Elastomers, Thermoplastic Elastomer (TPE), Thermoplastic Rubber (TPR), rubber, Hydrogel, and Thermoplastic Polyurethane (TPU). When the head and the absorption member are made of different materials, an amplitude of the head is different from an amplitude of the absorption member, and the head interferes the absorption member, thus absorbing vibration.

A putter head including a replaceable intermediate member that can be customized in size, shape, and performance according to user's preference is provided. A putter head according to an embodiment includes a front member having a shaft attachment portion and a front surface constituting a face surface, a rear member attached to a rear of the front member, and an intermediate member that is disposed between the front member and the rear member and is replaceable, and the intermediate member is selectable from a plurality of intermediate members formed in different sizes, shapes, or materials.

A golf club head includes a face, a crown, a sole, and defines a bore that is configured to receive and to selectively retain an elongate weight. The bore is aligned on a longitudinal axis that intersects the face. An elongate weight is insertable into the bore. The elongate weight is rotatable between a first angular position and a second angular position. The golf club head can further include a compliant stop positioned to contact a protrusion of the elongate weight, such that a torque threshold must be overcome to rotate the elongate weight.

A bat includes a handle having a proximate end and a distal end, a barrel having a hollow portion that accommodates the distal end, and a first damping section at least partially sandwiched between the handle and the barrel in the interior of the hollow portion. The first damping section includes a first portion in contact with each of the handle and the barrel in the interior of the hollow portion, and a second portion disposed closer to the proximate end than the first portion, the second portion being in contact with an inner peripheral surface of the barrel and not being in contact with an outer peripheral surface of the handle. In a cross section along a center axis of the barrel, the barrel has a depression depressed relative to the inner peripheral surface in the cross section, the second portion has a protrusion fitted in the depression.

A bat includes a handle having a proximate end and a distal end, a barrel having a hollow portion that accommodates the distal end, and a first damping section at least partially sandwiched between the handle and the barrel in the interior of the hollow portion. The first damping section includes a first portion in contact with each of the handle and the barrel in the interior of the hollow portion, and a second portion disposed closer to the proximate end than the first portion, the second portion being in contact with an inner peripheral surface of the barrel and not being in contact with an outer peripheral surface of the handle. In a cross section along a center axis of the barrel, the barrel has a depression depressed relative to the inner peripheral surface in the cross section, the second portion has a protrusion fitted in the depression.

A bat includes a handle having a proximate end and a distal end, a barrel having a hollow portion that accommodates the distal end, and a first damping section at least partially sandwiched between the handle and the barrel in the interior of the hollow portion. The material of the first damping section has a D hardness of 60 or more, a loss coefficient tan δ of 0.11 or more as determined under conditions of a temperature of 20° C., a frequency of 150 Hz, and the amount of strain 3000 μST, and a loss coefficient tan δ of 0.09 or more as determined under conditions of a temperature of 20° C., a frequency of 500 Hz, and the amount of strain 3000 μST.

A bat includes a handle having a proximate end and a distal end, a barrel having a hollow portion that accommodates the distal end, and a first damping section at least partially sandwiched between the handle and the barrel in the interior of the hollow portion. The material of the first damping section has a D hardness of 60 or more, a loss coefficient tan δ of 0.11 or more as determined under conditions of a temperature of 20° C., a frequency of 150 Hz, and the amount of strain 3000 μST, and a loss coefficient tan δ of 0.09 or more as determined under conditions of a temperature of 20° C., a frequency of 500 Hz, and the amount of strain 3000 μST.

Embodiments of golf club heads, golf clubs, and methods to manufacture golf club heads and golf clubs are generally described herein. In one example, a golf club heady ma include a hollow body portion having a toe portion with a toe portion edge, a heel portion with a heel portion edge, a back portion with a back wall portion, a top portion with a top portion edge, a sole portion with a sole portion edge, and a front portion. A face portion may be coupled to the front portion and include a front surface and a back surface. The body portion includes a face support portion including a composite material and coupled to the back surface of the face portion. The face support portion may include at least one reinforcement portion. Other examples and embodiments may be described and claimed.

Embodiments of golf club heads, golf clubs, and methods to manufacture golf club heads and golf clubs are generally described herein. In one example, a golf club heady ma include a hollow body portion having a toe portion with a toe portion edge, a heel portion with a heel portion edge, a back portion with a back wall portion, a top portion with a top portion edge, a sole portion with a sole portion edge, and a front portion. A face portion may be coupled to the front portion and include a front surface and a back surface. The body portion includes a face support portion including a composite material and coupled to the back surface of the face portion. The face support portion may include at least one reinforcement portion. Other examples and embodiments may be described and claimed.

A shock-absorbing device is applied in a ball/racket frame having a plurality of string holes allowing a string to pass, and includes: at least one or more outer tubular member, disposed at a periphery of the ball/racket frame and arranged between the string holes adjacently disposed, wherein two sides and an outer side of the outer tubular member are formed with an adhering surface and an outer tubular wall, and a bottom end of thereof is formed with an adhering part adhered at the periphery of the ball/racket frame; and an inner tubular member, disposed in the outer tubular member along an axial direction and an inner side thereof is formed with an inner tubular wall; accordingly, by providing interferences at different timings and bearing shock waves of a counter shock force generated while a ball being struck via the string, effects of absorbing shock and damping are achieved.