Product details:

This Shimano Ultegra R8000 11-Speed Cassette is tuned to maintain your rhythm with a consistent cadence. Ride anywhere with smooth and precise gear changes as this 11-speed cassette offers improved driving efficiency and stable shifting. Shave bike weight off without sacrificing durability or reliability. The all new Uletegra R8000 series is "pro-proven" as it is a direct trickle down from DURA-ACE groupset. You'll be able to ride harder with superior ergonomics and advanced control in all conditions.