Patent ID: 7794335

Claim:
A club head, comprising: a strike portion comprising a back face and a strike face opposite the back face; wherein: the back face comprises a first trench set; the first trench-set comprises a first trench of one or more trenches; at least the first trench comprises: a first shallow portion set with one or more first shallow portions; and a first deep portion set with one or more first deep portions; the first shallow portion set is shallower than the first deep portion set relative to a loft plane of the club head; the first trench-set further comprises: a second trench substantially parallel to the first trench; and a first rib set comprising one or more ribs; the one or more ribs having at least a first rib; at least the first rib of the first rib set comprises: one or more narrow portions with a first thickness; and one or more thick portions with a second thickness greater than the first thickness; the first rib is located between the first and second trenches; the strike face comprises a first groove and a second groove; at least two ribs of the first rib set are positioned substantially parallel and opposite to the first and second grooves; and two of the one or more trenches are interleaved with the first and second grooves.