Some embodiments include a first golf club head and a second golf club head. The first golf club head includes a body having a face portion, and the second golf club head includes a body having a face portion. Meanwhile, the first club face portion comprises a face surface and at least one first club groove, and the second club face portion comprises a face surface and at least one second club groove. An edge radius of the first club head groove(s) can be less than an edge radius of the second club head groove(s), a base width of the first club head groove(s) can be less than a base width of the second club head groove(s), and/or a sidewall angle of the first club head groove(s) can be greater than a sidewall angle of the second club head groove(s). Other embodiments of related club heads and methods are also disclosed.

A modular golf club assembly for facilitating playing the game of golf includes a plurality of golf club shafts. A plurality of couplers is each disposed on a respective one of the golf club shafts. A plurality of golf heads is provided and a respective one of the plurality of golf heads is releasably attachable to a respective one of the golf club shafts. A plurality of engagements is provided and each of the engagements is slidably integrated onto a respective one of the golf heads. Each of the engagements releasably engages a respective one of the couplers on a respective one of the golf club shafts for releasably retaining the respective golf club head on the respective golf club shaft.

A method includes: determining a mass of a golf shaft having a length; determining a center of mass of the golf shaft; determining one or more characteristics of an insert based on: the mass of the golf shaft; and a target mass for golf shafts having the length; determining a location of the insert between a first end of the golf shaft where a golf grip is to be attached and a second end of the golf shaft where a golf club head is to be attached based on: the center of mass of the golf shaft; and a target center of mass for golf shafts having the length; and inserting an insert having the determined one or more characteristics within an interior of the golf shaft at the determined location, thereby creating an interference fit between the insert and the interior of the golf shaft.

Iron-type golf club heads can have a high-COR face portion with an optimized face thickness profile that maximizes selected performance characteristics, such as ball speed, ball spin or ball trajectory angle, while maintaining certain required constraint properties, such as keeping stresses low for durability. Such face portions can have certain regions that are significantly stiffer than other regions of the face portion. For example, a low region of the face portion can be significantly stiffer than a high region of the face, or one quadrant of the face can be significantly stiffer than other quadrants of the face. Disclosed face thickness profiles can feature irregularly shaped contours that maximize the distribution of material in the face for optimal performance characteristics within defined constraints.

The present invention is direct to a set of golf clubs comprising long irons, mid-irons and short irons. The invention contemplates the use of titanium or steel for the main body portion and a tungsten weight member coupled to the toe and a tungsten heel weight member coupled in a hosel cavity.

A set of ball striking devices, such as a set golf clubs, having similar characteristics between clubs within the set of clubs such as length, weight, and lie angle. Characteristics can include lengths and lie angle.

Some embodiments include a first golf club head and a second golf club head. The first golf club head includes a body having a face portion, and the second golf club head includes a body having a face portion. Meanwhile, the first club face portion comprises a face surface and at least one first club groove, and the second club face portion comprises a face surface and at least one second club groove. An edge radius of the first club head groove(s) can be less than an edge radius of the second club head groove(s), a base width of the first club head groove(s) can be less than a base width of the second club head groove(s), and/or a sidewall angle of the first club head groove(s) can be greater than a sidewall angle of the second club head groove(s). Other embodiments of related club heads and methods are also disclosed.

Golf club heads including a striking face with a variable thickness, a shell including a crown, and an internal weight pad located on a lower portion of the shell. The center of gravity depths of at least two golf club heads in a set satisfy the equation: D=a−b*LA, with 19 mm<a<22 mm and b=0.36 mm/degrees, and the at least two golf club heads have a difference in loft angle LA of at least 5 degrees. A moment of inertia about a vertical axis through the center of gravity of each of the at least two golf club heads is at least 2900 g*cm.sup.2. In one aspect, a striking face has a center region having a first thickness T1, an intermediate region having a second thickness T2, and a perimeter region having a third thickness T3, with T2<T1<T3.

A co-forged iron type golf club is disclosed. More specifically, the present invention discloses an iron type golf club head from a pre-form billet that already contains two or more materials before the actual forging process resulting in a multi-material golf club head that doesn't require any post manufacturing operations such as machining, welding, swaging, gluing, and the like. The resultant golf club head may be capable of achieving center of gravity locations previously unachievable without utilizing this co-forging technique. The resultant golf club head may be used to create a set of golf club heads with center of gravity locations that are more advantageous throughout a set of golf clubs.

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.