Product Description Shimano sprocket for Dura-Ace CS-7800 and CS-7900 - 11, 12 or 13 tooth This Shimano sprocket is a common spare part for the Dura-Ace CS-7800 and CS-7900 10-speed cassettes. It comes with an integrated spacer and 11, 12 or 13 teeth. Ultegra CS-6600 and Ultegra CS-6700 cassettes are also compatible. Compatibility:Dura-Ace CS-7900Dura-Ace CS-7800Ultegra CS-6700Ultegra CS-6600Manufacturer Numbers:11 tooth:Y-1Z81100D12 tooth:Y-1Z81200D13 tooth:Y-1Z81300D Note: You can also find 14, 15, 16 sprockets for CS-7900 in our assortment.You can also find 14, 15, 16 sprockets for CS-7800 in our assortment.Contents:1 x Shimano sprocket with built-in spacer Manufacturer: Shimano Europe B.V. High Tech Campus 92 5656 AG Eindhoven Netherlands info@shimano-eu.com