This is a stainless steel ring with a shell embedded in the center. It is stamped with "316L" (see photo 3). The size is 9, but it may be slightly thinner compared to other companies' products. In my case, it became difficult to put on and take off when I was swollen. I have worn it a few times, but there are no noticeable scratches. Size: 9 Width: Approximately 1.5mm Material: 316L Color: Silver Material: Stainless steel Ring Size: 9 Accessories: None Scratches/Discoloration: None