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Appendix II, 4c of the 2008 edition of the Rules of Golf states that: "The design,
material and/or construction of, or any treatment to, the clubhead (which includes
the face) must not … have the effect of a spring which exceeds the limit set forth
in the Pendulum Test Protocol on file with the R&A"
Click here for the list of conforming and non-conforming drivers
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