One embodiment of a golf club head having movable weights includes a body with a face plate positioned at a forward portion of the golf club head, a sole positioned at a bottom portion of the golf club head, a crown positioned at a top portion of the golf club head and a skirt positioned around a periphery...http://www.google.es/patents/US7448963?utm_source=gb-gplus-sharePatente US7448963 - Golf club head having movable weights
