Hide those wires.
If you have internal routing, you can cleanly run your Ultegra Di2 wires with these rubber Grommets. They come in packs of four and are available in a 6mm round profile or a 7 x 8mm oval profile to match most frame's internal openings.
Confused about how to build your Di2 Kit? Read our Learn Article.
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Reviews & Community
Check fit before purchasing
I'm sure these would work fine on the right bike, but they didn't fit my 2012 Trek Madone. Be sure to measure the hole before purchasing. They are not universal, and I have no idea what bike they fit.