Specifications: Nickel-free metal, length: 39mm ＊ All products are handmade, please refer to the above description for the size. ＊ In order to accurately convey the actual color of the products, we are very careful when taking pictures. However, color differences may occur depending on different computer settings and indoor lighting. ＊ All products are sent by ordinary mail without insurance and tracking numbers. But if you don't feel comfortable and want to send it by "registered mail", please contact the designer before buying. / Use and maintenance methods / No accessories are recommended to take a bath or to be exposed to water for a long time! When the weather is humid in Taiwan, try to place a chain bag to isolate the air to prevent oxidation. Any jewelry will oxidize with time when it comes in contact with air. Try to avoid: water / sweat / sea water / hot spring water / pool water / chemicals etc. There are no items that can be as new as new. Try to protect the jewelry for a longer life.