| 摘要 |
<p>PURPOSE:To prevent a golf ball from getting over a protective net and flying out of a driving range or the like by controlling the ascent of the golf ball and lower the trajectory thereof to quicken the fall of the golf ball. CONSTITUTION:An one-piece ball (golf ball) 1 is formed on the surface with a large number of dimples 2. The diameter L of the dimple 2 is set to 3.3-3.7mm, the depth h of the dimple 2 set to 0.40-0.50mm and the number of the dimples 2 falls within the range of 320-340.</p> |
