SHIMANO ST-R9170 Dura-Ace Di2 Hydro Disc Brake Set

Shimano dual control hydraulic disc brake levers. More controllable and confidence in race condition Optimally balanced hydraulic brake system for racing  Dedicated brake lever shape, stroke, contact point, stiffness and dedicated shift paddles  Lightweight  Carbon composite plastic material of hood  More intuitive, quicker shifting operation  More defined click feeling and ergonomic shift lever position  Customizable function to fit any riding style  Each switch has the option for multi-shift ON or OFF  E-TUBE project  Optimum power transmitted with grip firmly  Ideal ergonomic cover shape with better thickness & tenderness  Openable hood cover  Simple set up and maintenance  Easy replace hood cover  Openable hood cover  Customizable the function to fit in rider's riding style