A golf club head having a recess located in a top portion thereof is described and claimed. The recess is located between the heel and the toe and extends toward the sole. The recess may be in the top line of the club head. An insert may be placed within the recess. The insert has a density that is less...http://www.google.es/patents/US7481718?utm_source=gb-gplus-sharePatente US7481718 - Golf club head with top line insert
