Material: 925 sterling silver Size of circle: approx. 1.5 cm x 1 cm International ring size: #8 ~ #15 *This product requires 7 ~ 14 working days. (Holidays excluded) Place of origin/produce methods: Taiwan C percent handmade. Package: https://www.cpercent.com.tw/images/package01.JPG Maintenance: 925 sterling silver---- When not in use, wipe it clean and put into a zipper bag avoid air. Use the silver polishing cloth wipe off the oxidation part. If having maintain problem please contact someone professional (polishing cloth become black is normal, do not wash with water).