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Players cited with this
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Callaway X-Forged prototype
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Srixon ZX7 irons
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Callaway Razr X Muscleback
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Callaway X Series JAWS wedges
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Callaway X Tour
also used by 1 of them

Callaway X Utility Prototype
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Photo credits
- Ernie Els — Photo_Ernie_Els.jpg : billypoonphotos derivative work: Bluedogtn ( talk ), CC BY-SA 2.0