The Shimano Ultegra ST-6770 Shifters are quality electronic shifters built to give you top performance every ride in a 10 speed system. As the signal generator of the drivetrain, they are a key piece in making the system shift- and oh do they shift well. Sending an electronic signal to the front or rear derailleur, the system will shift instantly and flawlessly every time, meaning you can dedicate more effort to your race or ride. Just tap either paddle and your Di2 system will effortlessly do the rest. When you're ready to step up to electronic 10 speed drivetrains, look no further than the 6770 Ultegra level Di2 from Shimano.