Custom butted 6066-T6 alloy construction. Variable-Radius Compact Flare (VR-CF) design adds flare to the drops for increased wrist clearance and a more ergonomic drop shape. Compatible with clip-on aero bars. The aero drop bar 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 set up. UCI-Compliant.