The shimano ultegra cs 6700 10 speed bicycle cassette is crafted with a rigid alloy sprocket carrier for a more lightweight durable profile that enables smooth more efficient gear shifting this innovative upgrade on shimanos classic 660 and sl versions features reduced weight ni plated hyperglide sprockets with improved teeth shaping and revised ramps for smoother quicker and more accurate shifting key features shimano ultegra cs 6700 bicycle cassette lightweight 10 speed cassette