You'll need a Shimano Ultegra Di2 Wire Cover for External Routing to keep the wires protected, concealed, and contained if your frame doesn't have an internal routing option. The kit comes with three long and three short pieces to route wires on most traditional frames from Small through X-Large. It's black finish nicely matches carbon frames.

Product Features
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Compatible Components: Shimano Ultegra Di2
Weight:
Recommended Use: ditching your mechanical tethers
Manufacturer Warranty: 3 years