Shimano's Lever Evolution: Refined Designs Slightly Larger Body: Dura-Ace ST-9120 vs 9100 Individual Levers: Right & Left Identical Shift Blades, Larger Hydraulic Body Familiar Comfort: Carbon Ergonomic Lever Blade Slimmer Lever Body: ST-9120 vs Mechanical/Hydraulic Predecessor Enhanced Grip: Textured Rubber Hood Hidden Asset: 14mm Reach Adjustment Improved Shift Action Reduced Shift Effort: Up & Down Rapid 'Down' Shifts: 'Instant Release' Enhanced Brake Action Lightweight Set: 505g, Inclusive Accessories Effortless Shifts: Compatible with 9100 Derailleurs Dura-Ace ST-R9120: Enhanced Shifting & Braking Shimano has diligently refined their lever bodies, resulting in the Dura-Ace ST-9120 Dual-Control Mechanical Shifter/Hydraulic Brake Lever body being almost imperceptibly larger than its 9100 mechanical/mechanical counterpart. The levers are sold separately, with one intended for the right and one for the left.