The nose ring hoops are made of pure G23 titanium which is Hypoallergenic, Nickelfree and leadfree. Safe material that is better than 316l surgical steel or stainless steel, harmless to human body. You needn't worry about allergies. It has a smooth closure that doesn't slipped or opened. It's still tight after longterm use. SAVES TIME: Easy to open and close the click closure by hand, Not require a tool. And it's still tight after longterm use, no need to worry about lost when bathing, walking or exercising. GUARANTEE POLICY:If you are not satisfied with the products.We give you money back or exchange guarantee. Please check the inside diameter carefully. Select the most suitable size for yourself. Gauge size(Thickness):16G=1.2mm Inner Diameter: 8mm(5/16 inches)10mm(25/64 inches). It can be used as body piercing hoops, nose rings hoop, lip rings, helix earrings, cartilage earring, conch piercing earrings, ear lobe earrings hoop.Perfect for Nose, Cartilage, Septum, Tragus, Rook, Lips, Belly Ring and Nipple Piercing.