All these faux septum rings are made from sterling silver. Inner diameters are listed below. You simply gently twist the ring, slip the end in one nostril and gently close to have a beautiful septum look without the piercing. For hygiene reasons, nose jewelry is NOT returnable or exchangeable. Please make sure 18 gauge is an appropriate gauge for your nose, and please sterilize before wearing. You are responsible for knowing what metals you are able to wear in your nose - please consult a dermatologist if you are unsure or have any questions. ‧⁺˚*･༓✿ Sizing ❀༓･*˚⁺‧ #1 - Raahi w/Labradorite, 8mm diameter #2 - Arwen w/Rainbow Moonstone, 8mm diameter #3 - Lyra w/Rainbow Moonstone, 8mm diameter #4 - Eir w/Rainbow Moonstone, 8mm diameter