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Shimano EW-SD50 Di2 E-Tube Wire 1000mm CheckoutSpec= 170 mm Dual compound of Salmon andShimano EW SD50 Di2 E Tube Wire 1000mm. Shimano E Tube wires and connectorsFrame grommets for E tube internal wiring compatible frames are sold separately see Shimano Frame Grommet Kit Electronic Shifter Extra Parts Ultegra Di2 wires utilize Shimanos e tube technology; e tube is a two prong system and is NOT cross compatible with Dura Ace 7970 Di2 wiring All e tube wires may be used for internal or external applications TECH SPECS Length 1000