The Vuka Stealth Aerobar features an integrated stem, base bar, and hardware, all wrapped in a simple, one piece design. The cables are routed internally for additional aerodynamics. And, if you're concerned about the bars being UCI 3:1 legal, you'll be pleased to know that the airfoil design engineered by Zipp fits all current regulations. The bars themselves were laid from unidirectional carbon. The process by which the fibers are laid is complex due to engineering load path and force, but by orienting the fibers in one direction, the bars are stiff, light, and provide more vibration dampening than the more popular woven fiber.