A player in doubt as to the conformity of a ball should consult the USGA.

A manufacturer should submit to the USGA samples of a ball to be manufactured for a ruling as to whether the ball conforms with the Rules. The samples become the property of the USGA for reference purposes. If a manufacturer fails to submit samples or, having submitted samples, fails to await a ruling before manufacturing and/or marketing the ball, the manufacturer assumes the risk of a ruling that the ball does not conform with the Rules.

The following paragraphs prescribe general regulations for the design of the ball, together with specifications and interpretations. Further information relating to these regulations and their proper interpretation is provided in "A Guide to the Rules on Clubs and Balls."

Where a ball is required to meet a specification within the Rules, it must be designed and manufactured with the intention of meeting that specification.

The ball must not be substantially different from the traditional and customary form and make. The material and construction of the ball must not be contrary to the purpose and intent of the Rules.

The weight of the ball must not be greater than 1.620 ounces avoirdupois (45.93 g).

The diameter of the ball must not be less than 1.680 inches (42.67 mm).

The ball must not be designed, manufactured or intentionally modified to have properties which differ from those of a spherically symmetrical ball.

The initial velocity of the ball must not exceed the limit specified under the conditions set forth in the Initial Velocity Standard for golf balls on file with the USGA.

The combined carry and roll of the ball, when tested on apparatus approved by the USGA, must not exceed the distance specified under the conditions set forth in the Overall Distance Standard for golf balls on file with the USGA.