A golf club head includes a striking face having a face center and defining a face plane, a virtual vertical center plane perpendicular to the face plane and passing through the face center, a sole portion, a top portion, a heel portion, a toe portion, a hose) configured to receive a shaft, and a loft, L, no less than 39. A center of gravity is spaced from the vertical center plane by a distance, D7. A moment of inertia, lyy, is measured about an axis extending in a heel to toe direction, parallel with a ground plane, and passes through the center of gravity, such that lyy/D7527.4 g.Math.cm/L23,580 g.Math.cm.

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.

The present invention is directed to a set of golf clubs comprising long irons, mid irons and short irons. Preferably, the long and mid irons have a face stabilizing bar and back panel that have a plurality of apertures in the face stabilizing bar and/or the back wall.

The present invention is directed to a set of golf clubs comprising long irons, mid irons and short irons. Preferably, the long and mid irons have a face stabilizing bar and back panel that have a plurality of apertures in the face stabilizing bar and/or the back wall.

An iron-type golf club having selectively machined portions and attributes, including a machined sole portion and/or a machined leading edge portion. The machined portion(s) include continuous machining scallop lines having a scallop height and a step-over distance. The scallop height is 10-75% of a finished leading edge radius at a vertical midpoint demarcation plane, and the step-over distance is less than 150% of the finished leading edge radius at the vertical midpoint demarcation plane.

Embodiments of golf club heads with sole cavity ports are described herein. The sole cavity ports can have varying thicknesses across the cavity port lengths. In some embodiments, one or more golf club heads can have two cavitiesa toe sole cavity and a heel sole cavity. Other examples and related methods are also disclosed herein.

Iron-type golf club heads are disclosed having a heel portion, a sole portion, a toe portion, a top-line portion, a front portion, a rear portion, and a striking face. The iron-type golf club heads include a flexible boundary structure (FBS) that is provided at one or more locations on the club head. The flexible boundary structure may comprise, in several embodiments, a slot, a channel, a gap, a thinned or weakened region, or other structure that enhances the capability of an adjacent or related portion of the golf club head to flex or deflect and to thereby provide a desired improvement in the performance of the golf club head.

A golf club set includes golf clubs having different loft angles and including weight-embedded golf clubs. Each of the weight-embedded golf clubs comprises a club head composed of a head main body having a club face for hitting a ball, and an internal weight member disposed in the head main body. The internal weight members of the weight-embedded golf clubs are arranged such that the loft angle is lager, the center of gravity of the internal weight member is positioned more on the toe side.

A golf club set 2 includes three or more golf clubs. A straight line passing through a face center Fc and parallel to a toe-heel direction is defined as an X-axis, and an X-coordinate of a sweet spot SS is defined as SS-X. When the SS-Xs of respective heads are defined as SS-X1, SS-X2, . . . , SS-Xn (n is an integer of equal to or greater than 3) in an ascending order of a loft angle from the head having the smallest loft angle, the set 2 satisfies the following formulas 1 and 2:
SS-X1SS-X2 . . . SS-Xn(Formula 1);
SS-X1>SS-Xn(Formula 2).

A system of golf club heads having reduced variability in characteristic time is disclosed herein. Further, a method of manufacturing a system of golf club heads having reduced variability in characteristic time is disclosed herein.