The product is 100% pure copper. The back of the copper must be open for the flow of energy. The bracelets are standard size, on average 20/25 grams and 17 cm, the width is 0.90. Suitable for daily use. It is sent with instructions for cleaning and care. Copper is a natural painkiller and effective against radiation. It is a jewelry. It provides copper and zinc support to the body. It protects from the evil eye. It is very effective for hand pain, arm and wind pain.