Shimano EW-SD50 Di2 E-Tube Wire 550mm. Shimano E-Tube wires and connectors

Frame 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