The Zipp Vuka Clip Aerobars w/ Alumina Race Extensions are designed to help you go faster and be comfortable. They are highly adjustable and can fine-tuned to perfectly fit rider ergonomics. The above bar mount puts riders into the "high-hands" position for optimized power and aero efficiency. Does not include base bar. Specifications: Rise: 52mm Stack Height: 60mm Bar Clamp Diameter: 31.8mm Extension Clamp Diameter: 22.2mm Internal Cable Routing Yes Shifter Fitment: Plug Style Material: 6066 Aluminum Color: Black Weight: 528g (Pair)