Custom-butted, 6066-T6 alloy construction;Variable Radius Compact Flare (VR-CF) increases wrist clearance for ergonomic positions;Compatible with Shimano EW-RS910 bar end Junction-A for cleaner Di2 routing;Compatible with clip-on aero bars;Shot-peened finish increases fatigue life;Laser-etched brake lever position lines for spot-on control setup;