| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a golf head superior in quality capable of preventing a coating layer from being ruptured even in the case of forming the coating layer over different types of metals. SOLUTION: The coating layer 4 comprises an expandable polyurethane resin constituted by bonding an aliphatic polyol with an isocyanate having elastic performance in the outer surface of a joint member 2 fastened to a head body 1.</p> |
