Patent ID: 8500573

Claim:
A golf club head comprising: a body portion; and a hosel extending from said body wherein a relationship between said body portion and said hosel defines a loft angle; wherein said loft angle is greater than about 45 degrees; wherein said body portion comprises a striking face portion and a rear portion; wherein said striking face portion has a thickness of less than about 2.0 mm at an impact point, said impact point defined as a point that bisection the scoreline in a lengthwise direction at a point 15 mm above a ground plane, wherein at least said impact point of said striking face portion has a martensitic crystalline structure; wherein said impact point of said striking face portion has a striking face hardness ratio of greater than about 1.3, and wherein said striking face hardness ratio is defined by a hardness of said striking face portion at said impact point divided by a hardness of said rear portion.