The Official Rules regarding Golf Balls
An appendix to the "Rules of Golf" defines that a golf ball must not weigh less than 45.93 grams, that its diameter must not be less than 42.67 mm, and that its shape may not differ significantly from a symmetric sphere. Like golf clubs, golf balls are subject to testing and approval by the Royal and
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Ancient Golf Club of St Andrews and the United States Golf Association, and those that do not conform with the regulations may not be used in competitions (Rule 5-1).
