Shimano's ST-R8150 Ultegra Rim Brake Di2 STI Shift Levers for Drop Bar deliver precise shifting. A new hood design provides riders with better grip, while still giving easy access to the shift lever in the drops Features: - 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 gear - Full and semi synchronized shifting programable, Synchro shift compatible meaning a single shifter can control both front and rear shifting which can be fully custom tuned to your riding preferences. Semi synchronized shifting means when a front shift is made the rear mech will automatically correct to the appropriate ratio - Simply pressing tactile buttons allows effortless and comfortable shifting even when your hands are cold - Drop bar STI with shift buttons located in a near identical place to the positions you'd assume shifting using a mechanical Shimano STI - Servo Wave brake lever pivot is positioned to be used with super SLR brake callipers, increase power providing excellent ergonomics when riding on the hoods - Finely tuneable reach adjusters for the levers enable custom fitment for all hands - Wired connection to the front and rear derailleurs with SD300 series wires Left shifter is 2-speed, right shifter is 12-speed Genuine, brand new, boxed Shimano product - Biketart are an official UK Shimano stockist.