Shimano SM-EW90-B Di2 5 Port Junction Box shifter Surface hardness is higher than

Surface hardness is higher than most coatings

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Shimano SM-EW90-B Di2 5 Port Junction Box shifter Surface hardness is higher thanShimano SM EW90 B 5 port Junction A for Dura Ace and Ultegra Di2 enables connection of time trial switches. This junction has a charging port to allow charging of an internal battery (charger not included), and mounts below stem using the supplied mounting strap. Features Compatible with ST 9071, SW 9071, SW_R671 or SW R600 For external installation Not compatible with Flight Deck