Shimano Di2 EW-SD300-I Electric Wire - 1200mm Long PDP|Colour All Enduro bottom brackets are

All Enduro bottom brackets are manufactured to the highest standards at the Enduro Bearings production facility in California

Nitrile (Pair)

Materials: Shimano doesn't list the materials used

don’t sweat it

but when it takes a hit from a rock it doesn’t have so much tension that it can’t move out of the way

Shimano Di2 EW-SD300-I Electric Wire - 1200mm Long PDP|Colour All Enduro bottom brackets areShimano's new SD300 electric wire cables for 12 speed Di2 groupsets. Features More compact design makes new electric components smaller and lighter Can be used across multiple 12 Speed DI2 series For internal routing usage (wire holder included) 1200mm Length