Shimano's Ultegra Di2 Dual Control Levers provide instantaneous, intelligent electric computerized shifting. With a simple, light touch of the easily accessed buttons, you get instant, perfect gear changes every time. They feature high-tech composite construction, too, for a feathery weight of 313 grams for the pair. Plus, the ergonomics are great, too, with comfortable hoods and anatomic levers for excellent shifting and braking control from all hand positions. And, because there are no cables and housing to stretch, wear or fail, you'll love Di2's amazingly operation year after year.