Golf club heads with a multi-material striking surface

A putter-type golf club head comprising:

• a body comprising:
• a heel portion;
• a toe portion opposite from the heel portion;
• a top rail;
• a sole portion opposite from the top rail;
• and
• a striking surface forming a recess defined by the heel portion, the toe portion, the top rail, and the sole portion of the body;
• a striking surface imaginary vertical axis that extends through a geometric center of the striking surface;
• and
• an insert configured to be received within and complimentary with the recess defined by the striking surface;
• wherein:
• the striking surface defines an upper border adjacent the top rail, and a bottom border adjacent the sole portion;
• the insert comprises a front surface adapted to impact a golf ball and a rear surface opposite the front surface, and a thickness defined as the distance between the front surface and the rear surface;
• the insert comprises a first material forming the rear surface and a second material forming a portion of the front surface;
• the insert defines a plurality continuous groove recesses forming non-ball contact areas of the striking surface;
• a width of the continuous groove recesses, measured in a top rail to sole direction, is constant across the striking surface in a heel portion to toe portion direction;
• the insert defines a plurality of land areas between the plurality of continuous groove recesses, the land areas forming ball contact areas of the striking face;
• a width of the land areas, measured in a top rail to sole direction, varies across the striking surface in a heel portion to toe portion direction;
• each continuous groove recess of the plurality of continuous groove recesses comprises a first end and a second end;
• at least one continuous groove recess comprises an arcuate portion extending across the striking surface imaginary vertical axis;
• and
• the first end and second end of at least one continuous groove recess is connected to the upper border.

A putter-type golf club head comprising:

• a body comprising:
• a heel portion;
• a toe portion opposite from the heel portion;
• a top rail;
• a sole portion opposite from the top rail;
• and
• a striking surface forming a recess defined by the heel portion, the toe portion, the top rail, and the sole portion of the body;
• a striking surface imaginary vertical axis that extends through a geometric center of the striking surface relative to the heel portion, the toe portion, the top rail, and the sole portion;
• a vertical reference axis offset from the striking surface imaginary vertical axis toward one of the toe portion or heel portion;
• and
• an insert configured to be received within and complimentary with the recess defined by the striking surface;
• wherein:
• the insert comprises a front surface adapted to impact a golf ball and a rear surface opposite the front surface, and a thickness defined as the distance between the front surface and the rear surface;
• the insert comprises a first material forming the rear surface and a second material forming a portion of the front surface;
• the insert defines a plurality continuous groove recesses forming non-ball contact areas of the striking surface;
• at least one continuous groove recess comprises an arcuate portion extending across the striking surface imaginary vertical axis;
• the insert defines a plurality of first land areas between the plurality of continuous groove recesses, the first land areas are formed by the second material;
• a width of the first land areas, measured in a top rail to sole direction, varies across the striking surface in a heel portion to toe portion direction;
• the first material of the insert entirely covers the rear surface of the insert and fills each continuous groove recess to form a plurality of second land areas;
• and
• the first land areas and the second land areas are adapted to impact the golf ball.