Patent ID: 8684861

Claim:
A golf club head comprising: a striking face having: a plurality of scorelines including a first scoreline and a second scoreline adjacent to the first scoreline; and a plurality of auxiliary grooves each spaced from the plurality of scorelines; and wherein, when the club head is in a reference position: in a first imaginary vertical plane generally perpendicular to the striking face and passing through the first and second scorelines: a first path is formed by a first intersection between the first imaginary vertical plane and the striking face; and the plurality of auxiliary grooves has a first concentration no less than 0.17 measured between the first scoreline and the second scoreline; and in a second imaginary vertical plane generally perpendicular to the striking face and passing through the first and second scorelines, the second imaginary vertical plane being horizontally spaced from the first imaginary plane: a second path is formed by a second intersection between the second imaginary vertical plane and the striking face, and the plurality of auxiliary grooves has a second concentration measured between the first scoreline and the second scoreline, the second concentration being different from the first concentration.