Golf club heads include a golf club head body, a ball striking face, and a shaft engaging member configured to engage a golf club shaft with the golf club head body. The golf club head may be configured with a first piece and a second piece, which may be in the form of the shaft engaging member and a body member connected to the shaft engaging member. The shaft engaging member includes a base member and an arm extending from the base member, and the body member includes a face having a striking surface configured for striking a ball and a club head body positioned behind the face, the second piece having a receiving slot positioned behind the face, where the base member of the first piece is at least partially received within the receiving slot.

A sporting apparatus includes a monitoring device. The monitoring device may add no weight to the sporting apparatus relative to a comparable sporting apparatus without the monitoring device. The monitoring device may have a center of gravity substantially aligning with the center of gravity of the sporting apparatus, resulting in a sporting apparatus with a monitor having substantially the same center of gravity as a comparable sporting apparatus without a monitor. The sporting apparatus monitor may be configured to trim unreliable post impact swing data and replace it with extrapolated pre-impact swing data and/or more reliable post impact swing data.

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 head includes a body portion comprising a material having a first density and an interior cavity having a filler material therein comprising a material having a second density. The golf club head also includes a first mass portion coupled to the body portion and a second mass portion coupled to the hosel portion. The first mass portion and the second mass portion comprise a material having a third density. A port on the body portion is configured to receive the first mass portion. At least a portion of the first mass portion is below a horizontal midplane of the body portion. The first density is greater than the second density. The third density is greater than the first density. A distance between a portion of the first mass portion and the hosel portion is substantially greater than a distance between the portion of the first mass portion and the toe portion edge. The first mass portion and the second mass portion have at least one different physical property. 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 head may include a body portion having a face portion including a front surface, a back surface, a plurality of front grooves on the front surface, a face perimeter, and a back groove portion on the back surface. The back groove portion may include a back groove portion length extending on the back surface of the face portion proximate to the face perimeter. The back groove portion length may be greater than or equal to 50% of the face perimeter. 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 head may include a body portion having a front portion, a first interior cavity in the body portion having a first opening in the front portion, a second interior cavity at least partially surrounded by the first interior cavity and having a second opening in the front portion, a first filler material at least partially filling the first interior cavity, and a second filler material at least partially filling the second interior cavity. The first face portion is attached to the front portion to close the first opening. The second face portion is attached to the front portion to close the second opening. The first filler material and the second filler material have at least one different physical property. Other examples and embodiments may be described and claimed.

A baseball or softball bat includes a barrel extending from a handle. A chamber is formed in the bat, such as in the knob attached to the handle, or an end cap attached to the barrel. A liquid or gel at least partially fills the chamber and dissipates vibrations created when the bat strikes an object.

A baseball or softball bat includes a barrel extending from a handle. A chamber is formed in the bat, such as in the knob attached to the handle, or an end cap attached to the barrel. A liquid or gel at least partially fills the chamber and dissipates vibrations created when the bat strikes an object.

A shaft insert (or external connecting segment) with greater flexibility than the substrate shaft allowing for a more flexible zone in an area of separation between two separated portions of the substrate shaft. The flexible connection is intended to be installed between two segments of the separated substrate shaft primarily on a golf putter with the flexible connection within 5 inches of the base of the club in total compliance with USGA (United States Golf Association) Rule 2, Appendix II. 2. b. requiring any change from the continuous shaft be within 5 inches of the club base. The shaft flex connection is designed to be symmetrical around its cross section with equal flexibility and torsional displacement in all directions in compliance with USGA Rule 2, Appendix 2. c. requiring golf shafts to be equally flexible with equal torsional displacement in all directions. The preferred embodiment of the invention utilizes a flexible tube for which the outside diameter is slightly smaller than the inside diameter of the substrate shaft. The substrate shaft is separated at the top of the hosel of the club and joined by fixing the tube (with epoxy or other adhesive) in each section of the separated sections of the substrate shaft whereby the separation is maintained at a fixed distance by installing an O ring or other spacer over the insert tube and between the two segments of the substrate shaft.

An iron-type golf club head according to one or more aspects of the present disclosure may include a striking face, a rear surface opposite the striking face, and a perimeter weighting element at least partially surrounding the rear surface. The club head may further include a resilient component associated with the perimeter-weighting element, the resilient component including a recess, and a preload spacer associated with the rear surface, a portion of the preload spacer engaging the recess. At least a portion of the resilient component is compressed between the preload spacer and the perimeter weighting element.

An iron-type golf club head according to one or more aspects of the present disclosure may include a striking face, a rear surface opposite the striking face, and a perimeter weighting element at least partially surrounding the rear surface. The club head may further include a resilient component associated with the perimeter-weighting element, the resilient component including a recess, and a preload spacer associated with the rear surface, a portion of the preload spacer engaging the recess. At least a portion of the resilient component is compressed between the preload spacer and the perimeter weighting element.