Putter-type golf club head

A putter-type golf club head comprising:

• a unitary construction metallic frame having a frame mass, a frame length of 40-130 mm, a frame width of 75-130 mm, a frame top, a frame bottom, a frame rear, a frame front forming a portion of a striking face, and formed of a frame material having a frame density;
• a sole member attached to the frame and having a SM density, a SM mass of no more than 8% of the frame mass, and an externally exposed sole member area of at least 400 mm2;
• a top-to-sole-member damper extending from the sole member to an internal surface of the frame top, the top-to-sole-member damper having a TTSM damper mass, a TTSM damper density, and a TTSM damper width;
• wherein:
• the putter-type golf club head has a total club head mass;
• a frame mass ratio of the frame mass to the total club head mass is 0.700-0.950;
• the striking face has a geometric center defining an origin for a club head origin X-axis, a club head origin Y-axis, and a club head origin Z-axis;
• the putter-type golf club head has a club head center of gravity CG located at a head origin x-axis CGx coordinate, a head origin y-axis CGy coordinate, a Zup distance above a ground plane, and defining a head center-of-gravity coordinate system having a CG X-axis, a CG Y-axis, and a CG Z-axis;
• the putter-type golf club head has a Ixx moment of inertia about the CG X-axis, a Iyy moment of inertia about the CG Y-axis, and a Izz moment of inertia about the CG Z-axis;
• the unitary construction metallic frame has a frame center of gravity CGf located at a head origin x-axis CGx-f coordinate and a head origin y-axis CGy-f coordinate of no more than 48 mm, and a Zup-f distance above the ground plane;
• and
• the sole member has a SM center of gravity CGsm located at a head origin x-axis CGx-sm coordinate and a head origin y-axis CGy-sm coordinate, where the head origin y-axis CGy-sm coordinate is greater than 20 mm.

A putter-type golf club head comprising:

• a unitary construction metallic frame having a frame mass, a frame length of 40-130 mm, a frame width of 75-130 mm, a frame top, a frame bottom, a frame rear, a frame front forming a portion of a striking face, and formed of a frame material having a frame density;
• a sole member attached to the frame and having a SM density, a SM mass of no more than 8% of the frame mass, and an externally exposed sole member area of at least 400 mm2;
• wherein:
• the putter-type golf club head has a total club head mass;
• a frame mass ratio of the frame mass to the total club head mass is 0.700-0.950;
• the striking face has a geometric center defining an origin for a club head origin X-axis, a club head origin Y-axis, and a club head origin Z-axis;
• the putter-type golf club head has a club head center of gravity CG located at a head origin x-axis CGx coordinate, a head origin y-axis CGy coordinate, a Zup distance above a ground plane, and defining a head center-of-gravity coordinate system having a CG X-axis, a CG Y-axis, and a CG Z-axis;
• the putter-type golf club head has a Ixx moment of inertia about the CG X-axis, a Iyy moment of inertia about the CG Y-axis, and a Izz moment of inertia about the CG Z-axis;
• the unitary construction metallic frame has a frame center of gravity CGf located at a head origin x-axis CGx-f coordinate and a head origin y-axis CGy-f coordinate of no more than 48 mm, and a Zup-f distance above the ground plane;
• the sole member has a SM center of gravity CGsm located at a head origin x-axis CGx-sm coordinate and a head origin y-axis CGy-sm coordinate, where the head origin y-axis CGy-sm coordinate is 20-52 mm;
• and
• the striking face includes a face insert comprising a polymeric material, the face insert includes a plurality of horizontal grooves, and at least one of the plurality of horizontal grooves has a groove surface angled downward at a 6-76 degree angle measured from a vertical axis.