A ball striking device, such as a golf club, includes a head that includes a face having a ball striking surface configured for striking a ball and a body connected to the face and extending rearward from the face. A face member formed primarily of a metallic material forms the face, and a body member is connected to the face member and extends rearward from the face member to form at least a portion of the body. The body member is formed at least partially of a polymer material, and has a doped portion containing a doping material dispersed within the polymer material. The doping material may have a different density than the polymer material, such that the doped portion has a different density than the portions of the body member not containing the doping material. A co-molding method may be used to form the ball striking device.

The invention is an alternative fitting system for golf clubs including a adapted production head with a threaded hosel and a shaft sleeve adapter and a compression nut. The shaft sleeve adapter is permanently adhered to a golf club shaft. The compression nut holds together the shaft sleeve adapter and the threaded hosel of the club head. Alignment notches on the threaded hosel and alignment features on the shaft sleeve adapter prevent unwanted rotation. Furthermore, some embodiments of the shaft sleeve adapter comprise an angled bore hole, which allows for various loft and lie configurations.

A shim or badge is affixed to a golf cub body to produce a cap-back iron, giving the appearance of a hollow-body iron. In this way, the golf club can be manufactured with the performance benefits of a game improvement iron, while providing the appearance of a blade, player's iron, and/or a hollow-body iron. For example, by using a lightweight and rigid shim or badge to close a cavity opening in the golf club body, the golf club head can provide increased stiffness in the topline, while maintaining a low CG. Various shim or badge arrangements and materials can be used, and a filler material and/or damper can be included within the cavity to improve sound and feel, while minimizing loss in COR.

A shim or badge is affixed to a golf cub body to produce a cap-back iron, giving the appearance of a hollow-body iron. In this way, the golf club can be manufactured with the performance benefits of a game improvement iron, while providing the appearance of a blade, player's iron, and/or a hollow-body iron. For example, by using a lightweight and rigid shim or badge to close a cavity opening and extend into the toe portion in the golf club body, the golf club head can provide increased stiffness in the topline, while lowering CG. Various shim or badge arrangements and materials can be used, and a filler material and/or damper can be included within the cavity to improve sound and feel, while minimizing loss in COR.

A method is described for playing a golf game, on a working surface of a golf course. The method includes providing (using) a predetermined set of rules. The predetermined set of rules are configured to identify a range of golf clubs, of a set of golf clubs, to be utilized in such a way that the predetermined set of rules, in use, promotes, at least in part, a prolonged life span of at least some of the golf clubs.

A golf club head including a club head body comprising a back portion, a striking face, and an interior cavity formed between the back portion and the striking face, wherein the striking face comprises a front surface configured to strike a golf ball and a rear surface opposite the front surface, wherein the back portion is spaced from the rear surface, wherein an aperture is formed through the back portion, a damping element comprising an exterior portion located behind the back portion of the club head body, a damping portion located within the interior cavity of the golf club head, wherein the damping portion comprises a front surface abutting the rear surface of the striking face and a rear surface abutting the back portion of the club head body.

A shim or badge is affixed to a golf cub body to produce a cap-back iron, giving the appearance of a hollow-body iron. In this way, the golf club can be manufactured with the performance benefits of a game improvement iron, while providing the appearance of a blade, player's iron, and/or a hollow-body iron. For example, by using a lightweight and rigid shim or badge to close a cavity opening and extend into the toe portion in the golf club body, the golf club head can provide increased stiffness in the topline, while lowering CG. Various shim or badge arrangements and materials can be used, and a filler material and/or damper can be included within the cavity to improve sound and feel, while minimizing loss in COR.

Embodiments of golf club heads and methods to manufacture golf club heads are generally described herein. In one example, a set of golf club heads includes a plurality of golf club heads with ach golf club head having a distinct loft angle ranging from 19.5° to 47°. Each golf club head produces a loudness as a result of striking a golf ball at a predetermined golf club head speed. The loudness is in sone units and is based on a sound pressure measurement performed at a predetermined sampling rate and taken for a fixed duration of time with a microphone placed directly above the golf ball at a fixed vertical distance. For a golf club head speed of 80 mph, the loudness of each golf club head ranges from 82.58 to 92.76 sones and is inversely related to loft angle. For a golf club head speed of 85 mph, the loudness of each golf club head ranges from 86.85 to 97.07 sones and is inversely related to loft angle. For a golf club head speed of 90 mph, the loudness of each of golf club head ranges from 92.90 to 101.82 sones and is inversely related to loft angle. Other examples and embodiments may be described and claimed.

Embodiments of golf club heads and methods to manufacture golf club heads are generally described herein. In one example, a golf club head may have a body portion having a toe portion, a heel portion, a top portion, a sole portion, a front portion, a lead edge portion, a back portion, and an interior cavity. The golf club head may also have a polymer material partially or entirely filling the interior cavity. Other examples and embodiments may be described and claimed.

A golf putter head assembly includes a putter head and a two-part hosel detachably mounted to the putter head by a single removable fastener. The two-part hosel includes a lower intermediate connector extending upwardly from the putter head, and an upper shaft connector extending upwardly from the intermediate connector. The fastener extends through a crown-to-sole through-bore formed in the putter head, through a longitudinal through-bore formed in the intermediate connector, and into a blind bore formed in a lower member of the shaft connector. An upper member of the shaft connector is mountable to a putter shaft. The upper member is angled relative to the lower member to define a shaft-head lie angle, and is offset from the lower member to define a shaft-head offset distance. The intermediate connector has a selected length that establishes a shaft-head balance characteristic. A kit and a method are also disclosed.