【★ Material】 Hand-made, international standard 925 sterling silver (hand-made electroless plating) 【★ Sizes】 About 1cm wide (Alternately, please confirm the correct size, if you find that the size is not correct after the production is completed, You will need to pay an additional fee for modifying the order. ) The following is a hands-on measurement method: https://farm5.staticflickr.com/4563/38353099266_af048c072c_b.jpg [★ Jewelry Gloss] Trouble notes "Suihua retro black" or "bright face" https://farm5.staticflickr.com/4438/36918921330_68c49b3f75.jpg 【★ Product Packaging】 Fashion texture flannel box, exquisite black small paper bag, clip chain storage bag, senior nano polishing silver cloth, business card guarantee card (including material maintenance instructions). 【★ Maintenance method】 1. Regular wear, body oil can provide protection, so that jewelry is not easy to 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 hot springs, seawater, and chemical agents to avoid vulcanization and blackening. 4. Usual cleaning can be used toothbrush dipped in toothpaste gently scrub, then rinse with water to dry the hair dryer can be dried. 【★ Warranty】 The necklaces are limited to pendants. Any problems with the necklaces can be returned within 7 days. We will replace them with new ones immediately. We can also provide free cleaning and maintenance. However, postage should be waived and no warranty will be given after one month.