The popular Sabona Tudor Copper Magnetic Wristband contains a 1700 gauss samarium cobalt magnet is in each tip. Sabona chooses Samarium Cobalt magnets for long term durability and rust resistant qualities. Sabona Copper Wristbands are made with the purest copper available-99.99%. All styles are designed for comfort and manufactured to maintain shape and quality appearance. Copper, when in contact with the skin, form chelates with human sweat (sometimes seen as a green deposit under the bracelet) and is thus absorbed through the skin. It can be removed with soap and water or lemon juice. To clean your Sabona bracelet, use a good jewelry cleaning cloth to keep the outside polished and the inside clean.