Musashi MR21 a wide stance thumb swivel (be sure to see the MR3 narrow stance thumb swivel). Some people feel the wide stance is too large and hard to “palm”. Others feel the MR3 is too small and prefer the MR21 wide stance.
Both models are designed to protect against Carpal Tunnel Syndrome. We recommend using a thumb swivel to protect your health and your career.
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FOR THE MR21-5.5:
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