[★ Material] Handmade, international standard 925 sterling silver (handmade electroless plating) [★ Size] Width 1.2cm (Please be sure to confirm the correct size after the completion of the ring, if the size is not correct after the completion of the production, An additional fee for the modification 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 hot springs, sea water and chemicals to avoid sulphurization and blackening. 4. Usually clean it with a toothbrush and toothpaste, then wash 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 seven days. We will replace the new product with you immediately. It can also be cleaned and maintained free of charge, but postage must be paid. We will not provide warranty after one month.