The Hoop Cartilage Earrings are safe, please feel free to wear. Gauge size: 20 gauge (0.8mm), inner size is 7mm. fit the cartilage of ears. Note: You may feel a little tight when you wear them first time, please press the opening part when opening and closing. It will adjust after several times of use. Package including: 1 pair of hoop earrings (2pcs * 7mm), and come with a beautiful gift bag. If you are not satisfied with the products or service, please contact us for free, we will handle that within 30 days. The hoop earrings are basic, made of 925 sterling silver. Fit the cartilage of ears. The size is 7mm.