Flexible Metal Duct Texture
It is an elastic duct made of aluminium foil and some metallic rings. The crumpled texture offers the flexibility for bending. Therefore, this kind of ducts is usually used as a gas pipe.

The color of the foil and metal rings can be changed by the Substance SBSAR file.
 
Flexible Plastic Electrical Conduit / Duct
It is a flexible plastic conduit for housing electrical or LAN cables to tidy up the wiring.

The color, level of distortion, amount of dirt etc. can be managed through the SBSAR file.