@czarivey time to get educated me thinks.
https://blog.eaglegroupmanufacturers.com/metal-properties-conductivity
The best materials for audio cables depend on the desired sound quality, budget, and application. The most important considerations are the conductor material and the insulation material:
Conductor material
The most conductive metals for audio cables are silver and copper:
Silver: The most conductive metal, but it's expensive and tarnishes when exposed to oxygen. Silver cables are perceived to have a brighter, more present sound.
Copper: The second most conductive metal, and the most common choice for audio cables. Copper cables are perceived to have a more balanced, "warm" sound.
Gold: Less conductive than copper or silver, and expensive to produce. Gold is often used as a coating on cable connector ends.
Aluminum: Has low conductivity and is typically used in inexpensive cables. Aluminum cables lack clarity and brightness.
Insulation material
Common insulation materials include PVC and Teflon:
PVC: Cost-effective and offers adequate protection for most applications.
Teflon: More expensive than PVC, but provides better heat resistance and durability.
Microporous PTFE: A low-density dielectric material that offers significant performance improvements over solid PTFE dielectrics.