Gauge Size - 16 gauge (thickness: 1.2mm), inner diameter 8mm. Please check inner diameter carefully. Select most suitable size for yourself. Material - Made of 316l surgical steel, and high polished smooth surface, comfortable to wear, high resistance to rust and corrosion, and it is hypoallergenic. But if you're extremely sensitive to metal, suggest you don't try it. Easy to Open and Close - We use the latest production process to strictly control the quality. Hinge will be very easy to open/close a click closure by hand, Not require a tool. Suitable for - Sold individually. It can be used as nose rings hoop, septum jewelry - septum ring, helix earrings, cartilage earring, rook earrings. Quality Assurance - If you have any questions, please contact us. We will make sure reply within 24 hours, and give you the solutions.