Made of 316L surgical steel (lead-free, nickel-free), won't infect your skin. Safely used for a long time. High-polished smooth surface, no sharp edge, no irritation. The Blue CZ makes your ear, nose or lip shiny & sparkle. Sold as a Single Piece. Size: Bar thickness: 16 gauge (1.2mm) Inner diameter: 8mm(5/16"). The thickness can be used for most piercings. Please choose the diameter carefully according to your piercing size and nose, ear or lip size. Hinged hoop: nose hoop/septum hoop/septum ring/nose ring/ear piercings earrings/helix earring/cartilage earring/conch earrings/conch piercing jewelry/rook earring/lobe earrings/daith earring/lobe piercing hoop/helix piercing jewelry/tragus earring. Hinge segment design. The clasp is pretty secured, easy to snap open, put on & snap close by hand, won't deformed. It's still tight after long-term use, needn't worry about losing. We have strict quality control, make sure you have a better feeling. Please don't hesitate to contact us if you got any questions. We are online for you. Comfortable for daily use. The classic silver color steel and simple design can be used for any occasion.