Imagine a world where every shift is immediate, smooth and precise, every gear, every time. Well, that world can be yours with Shimano's Dura-Ace Di2 Dual Control Shift/Brake Levers, a key part of their Dura-Ace Di2 electronic drivetrain. With a simple, light touch of the easily accessed buttons, you get instant gear changes and squeezing the levers applies the brakes with authority. Plus, these gorgeous levers are made of carbon and are outstandingly light. They boast comfortable, ergonomic hoods as well as sculpted levers that fit and feel great for awesome control, shifting and braking.