Arthritis Joint Pain, Lymphatic Drainage Ring Made of 100% solid copper, 100% Hypoallergenic, LEAD & NICKEL FREE. The inside is solid copper, and the outside is electroplated with a bright color. Stronger and durable, Never fade, Rust, Stain or Turn skin green, Tarnish, Corrode, long lasting lacquer coating to avoid oxidation, scratches resistant. Each copper Ring Length:2.36 inch (6 cm), Width: 0.24 inch (0.6 cm), Weight: 5g. Open design is easily adjustable, fit to any wrist size with just a light squeeze. Color: Grey