A golf club head is described having a body defining an interior cavity and comprising a heel portion, a toe portion, and a sole portion positioned at a bottom portion of the golf club head, and a crown positioned at a top portion. The body has a forward portion and a rearward portion. A face is positioned at the forward portion of the body. The face has a center face location and includes a center face characteristic time. An off-center location on the face is located at about −40 mm in a heel direction away from the center face location. The off-center location has an off-center characteristic time of at least 80% of the center face characteristic time.

A golf putter has a shaft of composite materials, a putter head having a stud for mounting to the shaft of composite materials, and a grip affixed to the shaft. The shaft is a hollow shaft and the surface is sanded and cleaned before a first layer of pre-preg material is rolled onto the shaft and secured with an adhesive layer. At least one additional layer of the pre-preg material is rolled onto the first layer of the pre-preg material and secured using adhesive. Additional layers of pre-preg material may be applied to the hollow shaft. Cellophane is wrapped on top of the at least one layer of the pre-preg material prior to heat curing of the hollow shaft. After heat curing, the cellophane is removed and the surface is sanded and decorated.

A golf putter grip includes a main body with a generally rounded diamond cross sectional shape and having and integrated green reading and alignment system, wherein the integrated green reading and alignment system includes two break measurement lines, each break measurement line on one side of the grip and configured to assist the golfer in gauging the angle of the flag, and wherein the integrated green reading and alignment system includes at least two alignment lines on a top of the grip and associated with the two break measurement lines and configured to assist in adjusting a club head face of an associated putter based upon the gauged angle of the flag. A golf putter implementing the golf putter grip with a conventional shaft and head with club face is disclosed.

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 recessed opening between a front opening and a back wall portion, a front plate portion coupled to the recessed opening to enclose a first interior cavity in the golf club head between the front plate portion and the back wall portion, a face portion coupled to a front portion to enclose a second interior cavity between the face portion and the front plate 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 filler material and the second filler material have at least one different physical property. Other examples and embodiments may be described and claimed.

Embodiments of golf clubs head sets with varying characteristics are disclosed herein. Other examples and related methods are also generally described herein.

A golf club having unique mass properties and all the benefits afforded therefrom.

A method of customizing a golf club, wherein the method includes generating operating data representative of a user operating a mechanical device. The operating data is generated by a first sensor sized and configured to be removably positioned in a mounting port formed on the mechanical device during operation of the mechanical device. The sensor is interchangeably positionable in the mounting port with at least one mass insert, the at least one mass insert being adapted to be interchangeably positioned in the mounting to provide at least two different mass configurations. The method further includes determining a recommended configuration of the at least one mass insert specific to the user based on the operating data generated by the sensor, and transmitting information representative of the recommended mass insert.

A method of customizing a golf club, wherein the method includes generating operating data representative of a user operating a mechanical device. The operating data is generated by a first sensor sized and configured to be removably positioned in a mounting port formed on the mechanical device during operation of the mechanical device. The sensor is interchangeably positionable in the mounting port with at least one mass insert, the at least one mass insert being adapted to be interchangeably positioned in the mounting to provide at least two different mass configurations. The method further includes determining a recommended configuration of the at least one mass insert specific to the user based on the operating data generated by the sensor, and transmitting information representative of the recommended mass insert.

Embodiments of golf clubs head sets with varying characteristics are disclosed herein. Other examples and related methods are also generally described herein.

The sole cavity ports described herein can have varying thicknesses across the cavity port lengths. In some embodiments, the golf club heads described herein can have a weight insertable into the sole port, wherein the weight can comprise a variable density. Other examples and related methods are also disclosed herein.