Yep. Suspension cables.
Fixed.
Hey If you do widen the nur slots will it negatively effect things if you go back to traditional string gauges?
I have done this on a few basses and have yet to have a problem doing it. I have only had one issue before with a nut slot to large and that issue wasn't with the depth. It had been improperly cut and was asymmetrical in cut profile with one side being a more shallow cut if that makes sense. It caused the string to keep popping out. But I haven't had a problem putting a .100-.110 in a slot that fits a .130.