The wires themselves are usually made of a metal such as copper.
Polyvinyl chloride Or PVC is a non metal. IT is plastic
PVC conduit is better then metal as it won't corrod under ground and theres less of a chance of electrical shortages.
PVC pipes are less expensive and easier to repair. Metal pipes are more expensive and more difficult to repair.
There are lawn chairs that are non-PVC which are located in various Pier one locations throughout the Untied States.
Neon is a non-metal. It is one of the Noble Gasses which are all non-metals.
Non metal
Oxygon is a non-metal
PVC pipe has less friction. They are also longer lasting than the others.
Non metal
non-metal
non-metal
Non-metal
non metal