Dual control 12-speed mechanical shifter with redesigned ergonomicsSmooth shifting lets you concentrate on the road.The new shape creates a shorter lever access curve, allowing riders with a wide range of hand sizes and shapes to reach their levers comfortably.FeaturesSHIMANO 105 R7120 DUAL CONTROL levers feature a redesigned lever position and handle shape, developed from data from an extensive study of different hand shapes. This is combined with the confidence in all conditions provided by hydraulic disc brakes and the fast, intuitive shifting that cyclists have come to expect from SHIMANO 105.