Copper -- though marginal -- is said to have magnetic properties. Use of pure copper relieves pain due to arthritis, rheumatism, and tendinitis. Copper has healing properties that function in accordance to one's body temperature and the humidity or moisture level of the body. Copper is said to have the property to disintegrate super oxide radicals that causes disturbances in the lubrication property in the joints, which may further cause rheumatoid arthritis and tendinitis.