Commodity material: 925 sterling silver Product size: circle diameter 1.3cm Customizable size range: International Ring Wai#4~#14 - I-Shan13 Cai Yishan Creative Design Metalworking artist Cai Yishan created his own brand I-Shan 13 in 2010, inheriting the ancient metalworking techniques, and building the beauty and creativity contained in the details of life into I-Shan13's jewelry creation in a single click. ＊Each work is handmade and will be slightly different from the picture. Please buy it again if you can accept it. - Maintenance and warranty After wearing it on weekdays, simply clean it and put it in the jewelry box to avoid contact with air. Metal oxidation is a normal phenomenon. If oxidation problems occur, you can use silver washing water and silver cloth for simple cleaning. The works provide after-sales service, please refer to the guarantee card content for details.