An improved golf club head wherein 70%-97% of the total head weight is within 3/4"-1" of the heel and toe ends of the head. The golf club head is provided with an echo chamber for improving audible feedback to the golfer. Upper and lower overhangs extending from the echo chamber enhance the feedback....http://www.google.es/patents/US5558332?utm_source=gb-gplus-sharePatente US5558332 - Golf club head
