Taking design cue's from Shimano's Dura-Ace line, the new Shimano Ultegra R8000 11-Speed Cassette offers optimum performance and durability, smooth shifting, and plenty of gearing options, all at a great value.Features: 11-Speed Cassette Available in an 11-25T or 11-28T cassette Wide gearing options Trickle down technology from Shimano's Dura-Ace line