| 摘要 |
<p>PROBLEM TO BE SOLVED: To retard repulsive force, to make the rolling of a ball gentle and to stabilize a direction by projecting both sides of a sweet spot to a front surface and forming the sweet spot face to a V shape or recessed shape. SOLUTION: Both sides 4 of the sweet spot 6 are projected forward and the sweet spot face 6 for hitting the ball is formed to the V shape or recessed shape. The sweet spot 6 is thereby made distinct and a golfer is easier to hit the ball. Weights are added to both sides 4 so that force can be placed on the ball hit straight so as to be pushed in and the directivity is improved. An air pressure chamber 2 is formed and an air elastic face 3 is formed, by which impact is absorbed, repulsion of the ball is delayed and gentle rolling is obtd. The probability of hole-out is improved.</p> |
