This is the Shimano Ultegra CS-6800 11-Speed Cassette. Using Hyperglide sprockets with revised tooth profiles, the CS-6800 11-Speed cassette features reduced wear and lightning-quick shifts. Even under the most demanding gear changes you can expect improved shifting thanks to a rigid aluminum carrier to keep the cogs in check.
Note: Looking for more Shimano Ultegra cassette options? Check out the CS-R8000 Cassette.
Close and wide-range gearing options Nickel-plated steel cogs for corrosion resistance HG-EV 11-Speed Cassette