The ergonomics on the Shimano Dura-Ace ST-R9270 dual control levers bring new levels comfort and control to road cycling. With fast wireless shifting and precise brake modulation Dura-Ace redefines performance. The Dura-Ace BR-R9270 hydraulic 2-piston calipers are sleek and compact. Mono-body construction ensures light weight and rigidity proving that good things can come in small packages.The wireless connection provides a clean cockpit enhancing the aesthetic of your bike while keeping shifting lightning fast1.5 to 2 years of battery life with easy-to-change CR1632 shifter batteriesWider pad clearance decreases the chance of rotor rubRaised hood peak improves ergonomics while a longer hood body increases hand supportCompatible with satellite shiftersMaintenance-friendly bleeding process