Agolf ball is a special ball designed to be used in the game ofgolf.Under the rules of golf,a golf ball has a mass no more than 1.620oz (45.9g), has a diameter not less than 1.680 inches (42.7mm), and performs within specified velocity, distance, and symmetry limits. Like golf clubs, golf balls are subject to testing and approval by The R&A (formerly part of the Royal and Ancient Golf Club of St Andrews) and the United States Golf Association,and those that do not conform with regulations may not be used in competitions