The Advent MX H-Series cassette is the smoothest shifting, most durable cassette that microSHIFT has ever made. That all starts with SpeedRamp, a series of discrete shifting ramps that move the chain quickly, quietly, and precisely under load. With separate ramps for moving the chain up and down the cassette, Advent MX delivers fast, quiet shifts so you can concentrate on enjoying the ride. SpeedRamp technology delivers faster, quieter shifting Replaceable small cogs extend service life 2 layered ED black finish provides additional corrosion resistance Aluminum 50t cog offers valuable weight savings Compatible with Advent MX Only Compatible with standard HG cassette hub bodies Specifications Range11-50Cogs11-13-15-18-21-24-28-32-36-42-50Cassette Body TypeShimano HGDrivetrain Speeds11ColorBlackWeight650Defined ColorBlack