| 摘要 |
<p>The inventive iron golf club comprises a head part having a face, and a restitution coefficient is in the range of at least 0.81 and not more than 0.95 when colliding a ball against a sweet spot in the face at a speed of 44 m/s. In the aforementioned iron golf club, the effective face area of the head part is at least 2500 mm2 and not more than 5000 mm2, the effective deflection length is at least 36 mm and not more than 72 mm, and the thickness of the face is at least 1.0 mm and not more than 2.5 mm at the sweet spot.</p> |
