Shimano's Ultegra Di2 Dual Control Levers bring the futuristic dream of instantaneous, intelligent shifting into the real world. With a simple, light touch of the easily accessed buttons, you get instant, precise gear changes every time. Shimano reached into the future yet again to find the ultimate blend of materials to keep the weight at a feathery 313 grams for the pair. Plus, the ergonomics are second to none with comfortable hoods and anatomic levers for revelatory shifting and braking control from multiple hand positions. And, because there are no cables and housing to stretch, wear or fail, you'll love Di2's amazingly durable, reliable, and silent operation.