Patent ID: 8858361

Claim:
A golf club head comprising: a heel portion; a toe portion opposite the heel portion; a hosel adapted to receive a shaft; a striking face, the striking face including: a plurality of score lines each having an average depth no less than about 0.10 mm; a first micro-groove pattern comprising a plurality of arcuate first micro-grooves, each of the first micro-grooves having a first average depth no greater than about 0.025 mm and a first average width no greater than about 0.51 mm, the first micro-grooves being substantially parallel to one another; and a second micro-groove pattern comprising a plurality of arcuate second micro-grooves, each of the second micro-grooves having a second average depth no greater than about 0.025 mm and a second average width different than the first average width, the second arcuate grooves being parallel to one another, wherein the second micro-groove pattern is overlaid onto the first micro-groove pattern; and a rear surface opposite the striking face.