Copper 10mm Plain Flat Band Rings Size 13 Beautifully Polished Pure Copper Ring. The Rich color of copper brings the best of the sun and earth together. Each Ring is thick, well formed and 10mm flat and wide. Copper is considered an excellent arthritis helper, easing the pain. Everyone is different and reacts differently to each energy presented by such products as copper, silver, and gold. These pure copper are shiny and beautifully polished with the energy of the Sun behind them. Size must be sent with each order. Only whole sizes currently available.