Copper is a great conductor of energy.
It's said to combat lethargy, restlessness and criticism of oneself.
It encourages a natural balance of energies, many use Copper to balance the Chakras and Meridians. Thought to support connection to knowledge from higher realms and the subconscious mind.
In healing, it's thought to bring higher energies into the soul stimulating our original state of perfection (and our belief there of).
Physically copper is said to be healing and soothing to people with conditions of the joints and ground erratic energy.