Introducing the Campagnolo Chorus 11x Cassette that has every sprocket tooth designed to achieve the maximum synchronization, shifting speed, and silent operation.SteelNickel-chromed finishLight alloy supports for the final two triplets11x Spacing11x Tooth machining11x Light alloy lockringThread 27 x 1Weight 230gThe six larger sprockets have a double frame system for extreme torsional stiffness so that operating precision is maintained even during shifting under stress. The surface treatment of the 11 steel sprockets assures longer component life, maintaining the maximum long term performance.Warning: EPS Groupsets will not work with 11/29 ratio cassettes. Use 12/29 instead.