[★ Material] Handmade, international standard 925 sterling silver (handmade electroless plating) [★ Size] About 1cm wide (Please make sure that the correct size is confirmed. If the size is not correct after the production is completed, you need to modify it. An additional fee for the modification of the ring is required. ) Here is your own hands-on measurement: https://farm5.staticflickr.com/4563/38353099266_af048c072c_b.jpg [★ jewelry gloss] Trouble note "Suihua vintage black" or "Glossy" https://farm5.staticflickr.com/4438/36918921330_68c49b3f75.jpg [★ Product packaging] Fashion texture flannel small carton, exquisite black small paper bag, zipper storage bag, high-grade nano silver cloth, business card guarantee card (including material maintenance instructions). [★ Maintenance method] 1. Always wear, body oil can provide protection, so that jewelry is not easy to black. 2. If it is not worn for a long time, it can be wiped with a silver cloth and put into a sealed bag. 3. Do not soak the hot springs, sea water and chemicals to avoid sulphurization and blackening. 4. Usually clean it with a toothbrush and toothpaste, then rinse it with water and blow it off. [★ Warranty] Necklace warranty is limited to pendants. If there are any problems with the necklace, it can be returned within 7 days. We will replace the new product with you immediately. It can also be cleaned and maintained free of charge. However, postage must be paid and no warranty will be provided after one month.