Profile Design Aeria T4 Alloy Wing Aerobar. The Profile Design Aeria T4 Alloy Wing Aerobar, with its combination of aluminum aero basebar and aluminum T4 aerobar extensions, provides a convenient, all in one aerodynamic cockpit that's your ticket to the podium. This aggressive, UCI compliant basebar not only features a 3:1 aerodynamic profile that slices through the wind with ease but also sports zero drop from the clamp to brake extensions to ensure a shorter reach and better control. The T4 aerobar extensions feature a shallow ski bend design that provides a single neutral wrist angle with a low extension length for better aerodynamics. The extension itself is construction of aluminum and can be adjusted in length from 150mm to 305mm. Additionally, the sleek and slim stackable risers and easy to adjust brackets and armrests let you dial in your perfect fit for the ultimate in performance plus comfort. Note: The Aeria T4 Alloy Wing Aerobar is pictured with aero brake levers but those are NOT included. Brake levers must be purchased separately.