Wire thickness 0.8mm(20 gauge), 3 different inner diameter: 8mm/9mm/10mm. Black color PVD coated. Made of implant grade 316L surgical steel material.Nickel ,lead and hypoallergenic.(Sold as 3pcs) Service: Similar picture,but ours comfortable to wear without sharp edge,safe and comfortable. We inspect each ring before shippment to guarantee a good customer experience and brandbuilding. Any question/issue,message us freely,reply within one day. Using: Easily open and close for changing out by hand but stay securely closed while wearing. No rough edges,completely smooth once clasped. Never lose if you don't open the hinged clasp. 3 size rings is fit for different body parts.8mm/9mm/10mm fit for standard 20g nose/cartilage/rook/tragus/lobe/helix/daith piercing. Sleepertype earring hoops,comfortable when sleeping.Also don't need take out when bathing. Advantage: Surgical steel material has excellent biocompatibility,great for sensitive skin.Almost had no irritation or allergic reaction. It hugs your nose and is actually seamless. It's tight after longterm use as strict Inspection before shippment. 3 different size ring avoid unnecessary size trouble(too small/big),save your time, better customer experience. We have ten years of experience in selling body piercing and are "Professional Seller". Tips: Bigger gauge smaller in thickness size.For example: 20ga0.8mm, 18g1.0mm, 16g1.2mm, 14g1.6mm pls check our image carefully,if found too big, pls turn to diameter 5/6/7mm.You can exchange different size through "Online Returns Center",getting a replacement for . Piercing hole should be fully healed before wearing. Rings should be sterilized before using.