Custom-butted, 6066-T6 alloy construction. Variable Radius Compact Flare (VR-CF) increases wrist clearance for ergonomic positions. Compatible with clip-on aero bars. Aero / Dropbar profile is more aerodynamic compared to traditional round bars. Internal cable routing for Di2 and standard housing. Laser-etched brake lever position lines for spot-on control setup. UCI compliant.