A thread-wound golf ball has a wound core consisting of a center with a diameter of 29-37 mm and a rubber thread layer with a thickness of 1.0-2.5 mm. A cover enclosing the wound core is of two-layer construction comprising a relatively soft inner cover layer and a relatively hard outer cover layer having...http://www.google.com/patents/US6142885?utm_source=gb-gplus-sharePatent US6142885 - Thread-wound golf ball
