Wire thickness 0.8mm(20g), Inner diameter: 8mm(5/16 inch).Package contain 3 colours: black/gold/silver tone, each colour 1pc. Made of implant grade 316L surgical steel material.Faux septum nose rings ,nickel free,lead free and hypoallergenic.(Sold by 3 colours) Using: Easily open and close hinge for changing out by hand but stay securely closed while wearing. No rough edges,completely smooth once click clasped. Never lose if you don't open the hinged clasp. 8mm fit for regular nose/tragus/helix/cartilage/rook/daith/snug/lip/lobe piercing. Sleeper-type earring hoop,comfortable when sleeping.Also don't need take out when bathing. Fastening: Clicker 3 Colour: 0.8x8mm-black/gold/silver tone cac-uk-seg1-20g8mm 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. Sturdy, clip holds well, doesnt irritate the skin. It's tight after long-term use as strict Inspection before shippment. pls check our image carefully,if found too small, pls turn to diameter 9/10mm. Similar picture,but ours comfortable to wear without sharp edge,safe and comfortable.