Golf drivers with an excessive spring-like effect on the club face will be banned at next year's British Open.
The Royal and Ancient has followed its counterpart in the United States - the US Golf Association - by introducing a "coefficient of restitution" (COR), which effectively governs how fast the ball leaves the club face.
The new coefficient of 0.83, which is designed to limit the ever-increasing driving distances of leading professionals, will not apply to amateur events in Britain.
Golf: Drivers tamed by British Open rule
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