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What if any difference does this finish make
Depends what finish they use. Bright silver on cassettes is usually nickel plating, which is used for corrosion protection and might offer lower friction than the base metal. The ED black is also a corrosion inhibitor, but it's softer than nickel plate. In practice, on a heavily used bike neither will make much more than a cosmetic difference.
gbj_tester
paulbiche
The Sunrace MS8 Wide-Ratio Cassette comes in two finishes, black and metal.
What if any difference does this finish make to durability or performance?