PGA TOURのインスタグラム(pgatour) - 7月19日 09時35分
This ball and chain measures green firmness. The ball weighs between 2-3 lbs, the chain is 6 ft long. The indentation left behind after the ball is dropped gets measured to determine the firmness!
[BIHAKUEN]UVシールド(UVShield)
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2018/7/19