Every sprocket tooth has been designed to achieve the maximum synchronization, shifting speed, and silent operation. The 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 eleven steel sprockets assures longer component life, maintaining the maximum performance through time. Specification 11-Speed only ULTRA-SHIFT TEETH DESIGN: every sprocket tooth is designed and placed to perform a specific function, such as raising or lowering the chain or giving maximum power transmission to the wheel NICKEL-CHROME SURFACE TREATMENT: reduces chain/sprocket friction - extends sprocket life Size: 11-23T, 11-25T, 11-27T, 11-29T, 12-25T, 12-27T, 12-29T Top Quality 11 speed Campagnolo road bike cassette with alloy sprocket carrier. Ultra Drive 11 speed sprockets which will work with any 11 speed Campagnolo setup. Hard wearing steel nickel-chrome finished sprockets. Weight: approx 236g. Complete with alloy Lock ring.