fi"zi:k Arione CX Saddles, lightweight road saddle featuring Twin Flex/Wing Flex, carbon shell and Kium or Braided Carbon rails.Nylon carbon-reinforced shellCarbon Braided Rail: sleeve of braided carbon fibers filled with unidirectional carbon fibers that are capable of expanding and contractingICS integrated Clip SystemK:ium Rail: special alloy with a high strength-to-weight ratio and excellent vibration damping; 8% weight reduction compared to solid titaniumK:ium is a rail material created by fi"zi:k, k:ium is 8% lighter than titanium and has the same resistance to fatigue and vibration absorptionWing FlexICS Integrated Clip SystemItem SpecificationsColorBlack/RedWeight205gWidth132mmLength300mmGenderMen"sRailKiumClamp StyleStd RailsDefined ColorBlack