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 gearSimply pressing tactile buttons allows effortless and comfortable shifting even when your hands are coldShifters are lightweight thanks to carbon fibre lever blades, carbon composite bracket body, and a titanium clamp band / fixing boltDrop bar STI with shift buttons located in a near identical place to the positions you'd assume shifting using a mechanical Shimano STIServo Wave brake lever pivot is positioned to be used with super SLR brake callipers, increase power providing excellent ergonomics when riding on the hoodsFinely tuneable reach adjusters for the levers enable custom fitment for all handsWired connection to the front and rear derailleurs with SD300 series wires - E-tube wires Not included