The USGA occasionally develops new proposals regarding golf equipment. These proposals are submitted to manufacturers or published in press releases. A comment period is allowed before the USGA makes any decision on enacting such proposals.
Notice to Manufacturers - New Groove Regulations
Notice to Manufacturers - Club Adjustability
Limit On Clubhead Moment Of Inertia
Interim Interpretation of Spring Features in Clubheads
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Guide To The Rules On Clubs And Balls