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Double Bass Shielding

Magnetic pickups need some metal in the strings, or they won't work. Other more common pickups, like piezo, convert mechanical vibration into a signal, in which case the type of string doesn't matter. What pickup are you using?
You reason for asking may involve a ground wire (I think the older Fishman had this) that you had to weave through the strings to make sure they didn't pick up any stray RF noise.
In this case, using guts or non-conductive nylons wouldn't be an issue.