[★ Material] Handmade, international standard 925 sterling silver (handmade without electroplating) [★ Size] Approximately 1.7cm in width (Be sure to confirm the correct size of the ring. If the size is found to be inappropriate after the production is completed, you need to modify it. You will need to charge an additional cost for the modification of the ring. ) Here's how to do it yourself: https://farm5.staticflickr.com/4563/38353099266_af048c072c_b.jpg [★ Jewelry Gloss] Trouble remarks "Louhua retro dyed black" or "glossy" https://farm5.staticflickr.com/4438/36918921330_68c49b3f75.jpg [★ Product Packaging] Fashion texture flannel small paper box, exquisite black small paper bag, chain storage bag, high-grade nano silver cloth, business card guarantee card (including material maintenance instructions). [★ Maintenance method] 1. Frequently worn, the body oil can provide protection, so that the jewelry is not easy to turn black. 2. If you do not wear it for a long time, you can wipe it with a silver cloth and put it in a sealed bag. 3. Do not soak in hot springs, sea water, and chemicals to prevent sulfur from turning black. 4. Usually clean with a toothbrush and toothpaste, and then gently scrub, then rinse with water and blow dry. 【★ Warranty】 If there is any problem, the ring can be returned within seven days. We will replace it with a new product immediately. It can also be cleaned and maintained for free.