Material: 925 sterling silver Product size: circle diameter 1.3cm Customizable size range: International Ring #4~#14 - I-Shan13 Cai Yishan creative design Metalworking artist Cai Yishan, who created his own brand I-Shan in 2010, continued the ancient goldwork technique, and built the beauty of life details into the jewelry creation of I-Shan13 in a minute. *Each piece of work is hand-made and will be slightly different from the picture. Please accept it again. - Maintenance and warranty After wearing it on weekdays, simply clean it into the jewelry box to avoid contact with the air. Metal oxidation is a normal phenomenon. If oxidation problems occur, use silver-washed water and silver cloth for simple cleaning. The work provides after-sales service. Please refer to the guarantee card for details.