The Shimano Ultegra FC-6800 Chainring is for the Shimano Ultegra FC-6800 11-spd double crankset. This chainring can also be used for Shimano Dura-Ace FC-9000 but does not match in material appearance and color. Shaped from machined aluminum the chainring is stiff and light, and is developed for use with Shimano 11-speed chains.