A conductor is a material through which an electrical current or signal can flow easily. Copper, copper-covered steel, and aluminum are the three most common conductor materials used in coaxial cables. Copper is the most commonly used material since it has high conductivity, is reasonably priced, and is easy to form or shape.  Aluminum is less expensive than copper; however, it has a lower conductivity than copper. Aluminum wire is used for the braid coverage.