exposed wiring on 02 sensor

[DuCartney]

Hello everyone,

I recently installed a new exhaust system on my 2012 M696.  After extending the wiring on the front O2 sensor and soldering both ends, I realized I forgot to place the heat shrink (rookie mistake), leaving me with 4-16 gauge wires exposed.  I do not want to cut and resolder (as I'm not very great at it) and I don't want to use standard electrical tape as sits close to the exhaust system.  Does anyone know what the cloth-like material that was originally around the wiring is called and where I can get some? 

Thank you so much in advance,

Cartney