US Patent 9381409 Multiple-material iron

The present invention discloses an iron-type golf club head formed from multiple materials that increase torsional stiffness of the club and aid in sound performance. In particular, the iron-type golf club head includes a rear flange and a composite component bonded to an external surface of the rear flange. The composite component may cover an entire surface of the rear flange, and may also extend upwards to make contact with a top portion of the club head and thus close off a rear cavity of the club head. The iron-type golf club head may further comprise a face support structure extending from the rear flange, to which the face plate may be affixed via welding or brazing.