| 摘要 |
A golf club head comprises a face portion whose front face forms a clubface having a clubface roll of a radius R, and the clubface is provided with a plurality of parallel grooves extending straight at an angle of not more than 10 degrees with respect to the toe-and-heel direction of the head so as to form at least one lateral zone between the parallel grooves, wherein the above-mentioned at least one lateral zone is provided with a convex curve of a radius (r) smaller than the radius R of the clubface roll.
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