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*NEW 2010 EDITION (3.1)* This publication contains guidelines to help manufacturers, Tournament Officials and other interested parties interpret the Rules relating to the design and manufacture of golf clubs and balls, as set out in Appendices II and III of the Rules of Golf. Full details of the new groove Rules are included. As is the case for the Rules themselves, these guidelines will continue to be reviewed and modifications may be required from time to time in the future. The principles and philosophy expressed within this publication are held by both The R&A and the United States Golf Association.