Not sold at retail, but you can browse UST Mamiya
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Players cited with this
Cameron SmithPRESS“Driver: Titleist 917D3 (UST Mamiya Elements Chrome proto), 10.5 degrees”
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Rod PamplingPRESS“Driver: TaylorMade M2 (UST Mamiya Elements prototype), 10.5 degrees”
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Players who use this also use
UST Mamiya Elements Gold Proto 8F5
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UST Mamiya Elements Platinum 8F5 X
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UST Mamiya Elements Red 8F5X
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Fujikura Ventus Blue HB
also used by 1 of them

Fujikura Ventus Red TR
also used by 1 of them

Fujikura Ventus TR Blue
also used by 1 of them
Photo credits
- Cameron Smith — JazzyJoeyD, CC BY-SA 4.0
- Rod Pampling — Rod_Pampling_2008_US_Open_practice_round.jpg : Jeffrey Gordon (thegordons @ Flickr) derivative work: Austin512 ( talk ), CC BY-SA 2.0