Gauge Size - 10 gague (thickness: 2.5mm), inner diameter 8mm. Please check inner diameter carefully. Select most suitable size for yourself. Hypoallergenic Material - Made of 316L surgical steel, and high polished smooth surface, comfortable to wear, high resistance to rust and corrosion, more importantly, it is Hypoallergenic. 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. Multi-usage - Sold individually. It can be used as septum and cartilage earlobe piercings. Quality Assurance - If you have any questions, please contact us. We will make sure reply you in with 24 hours, and give you the solutions as well.