I bought a set of Dura-Ace 7900 10-speed STI bar end shifters two years ago. If your question is about compatibility, you can check this at the Sheldon Brown website to determine what is compatible Shimano Dura-Ace Compatibility or go to the Shimano website where you will find something like this: Celebrazio: Bicycling - Shimano Road Bike Parts Compatibility - 2014 but for the 7900.