OAKKY Cultures: We are a professional jewelry store. Variety of jewelry for your choice here. 316l stainless steel metal material is the most popular jewelry nowadays. High quality of goods earns many repeat orders. Why not try now ? Item Details: Surface Width: 3.5 - 21 mm Weight: 15g Design: inlaid agate High-quality 316l stainless steel,resistant to acid,alkali resistant. Manual polishing,smooth inside. Due to manual measurement, there might be 1-2 mm differences, hope you can understand.