The product will be sent as one. It is made entirely of 316 L surgical steel and does not tarnish. Easy to Use. It is antiallergenic, so it does not cause allergic reactions. Thickness: 1 mm. Ring Diameter: 12 mm. The product will be sent as one. It is made entirely of 316 L surgical steel and does not tarnish. Easy to Use. It is antiallergenic, so it does not cause allergic reactions. Thickness: 1 mm. Ring Diameter: 12 mm.