Easy To Use: It is easy to insert by hand without a tool. The closure is seamless. And it's still tight after longterm use, needn't to worry about lost when working, walking or exercising. Material: 316L Surgical Steel + Cubic Zircon. 316L Surgical Steel ( lead free, nickel free and cadmium free ) is the most basic metal used in body jewelry and suitable for sensitive skin. No worry about allergies.Light weight and comfortable to wear. A Perfect Fit: This hinged hoop fits perfectly on both women and men.It can be used as helix earring,rook earring,rook piercing jewelry,conch earring,conch piercing jewelry,helix piercing jewelry,septum ring,septum hoop,nose ring,nose hoop,lip ring,ear piercings earrings. Color&Size : Silver ;16 gauge (thickness: 1.2mm), inner diameter 10mm(25/64"). Sold individually. Please see our size pictures for suggestion,Please carefully select your most suitable gauge and prefered color before your order. Best gift for your girlfriends, wife, mother and friends on christmas,anniversary, birthday, party and new year. Also a great idea for yourself.