With Di2 technology shifting is easy and precise - just a light touch, as soft as a mouse click, is sufficient for the front or rear derailleur to instantaneously select the correct gearThe removal of traditional mechanical cables in favour of electrical wires eliminates poor shifting caused by contaminates, corrosion and stretching, and also provides effortless gear shiftsSimply pressing tactile buttons allows effortless and comfortable shifting even when your hands are coldDrop bar STI with shift buttons located in a near identical place to the positions you'd assume shifting using a mechanical Shimano STIHydraulic brake lever provides excellent stopping power with less effort especially from the hood positionHydraulic reservoir tank provides pad to rotor clearance auto-adjust maintaining braking performance during pad wearReach and free stroke adjustment enable custom feel and fitment for all handsLevers are supplied without electrical cables, as these need to be ordered separately to suitFor use with E-tube electric cablesKit contains ST-R785 STI, BR-RS805 flat mount brake callipers with pads, hoses and mineral oil (without rotors or adapters)