The bracelets are standard size and are on average 17 cm. The width is 0.50 cm. They are on average 16/17 grams and are suitable for daily use. The product is 100% pure copper. The back of the copper must be open for energy flow. We should wear the copper during the day and leave it in the soil at night. This way we will get more efficiency. Pure copper will definitely darken with vinegar. It is cleaned by wiping with salt. •It leaves a green color on the arm. These are the expected situations since it is pure copper. It is sent with the instructions for use. With health and healing….