This top of the range hydraulic Shimano Dura-Ace Di2 disc brake STI lever and brake calliper gives you the best braking control with little effort in every riding condition. This new Dura-Ace Di2 connects wirelessly to your front and rear derailleur to provide seamless, effortless and precise shifting with a light touch even when your hands are cold. Features: The shifters are lightweight thanks to carbon fibre lever blades, carbon composite bracket body, and a titanium clamp band / fixing bolt. Drop bar STI with shift buttons located in a near identical place to the positions you'd assume shifting using a mechanical Shimano STI Hydraulic reservoir tank provides pad to rotor clearance auto-adjust maintaining braking performance during pad wear Hydraulic brake lever with Servo Wave technology provides excellent stopping power with less effort especially from the hood position Finely tuneable reach adjusters for the levers enable custom fitment for all hands Free stroke adjustment for pad to rotor contact setting Levers use CR1632 batteries which last for approximately 1.5-2 years Ports for use with SD300 E-tube electric cables Kit contains bled ST-R9270 STI, BR-R9270 flat mount brake calliper with pads, hoses and mineral oil (without rotors or adapters Weight: 350g (Pair)