Disclosed is a two-piece solid golf ball satisfying the following conditions (1) to (4): (1) an outer cover predominantly contains a polyurethane material; (2) the outer cover has a thickness of 2.15 to 2.9 mm; (3) a core is formed from a rubber material; and ...http://www.google.com.au/patents/US6966850?utm_source=gb-gplus-sharePatent US6966850 - Two-piece solid golf ball
