material
-copper
size
- inside circumference about 4.8 CM, thickness about 1MM, tbiggest width about 1CM
ring size chart :
https://www.dropbox.com/s/uvbnnf2bgot7mix/%E6%88%92%E5%9C%8D%E5%B0%BA%E5%AF%B8%E5%B0%8D%E7%85%A7%E8%A1%A8.pdf?dl=0