The one you see on the model is a handcrafted 14K gold filled, 7mm diameter, 4mm swirl nose ring. HOW TO MEASURE YOUR SIZE: The size you need is the inside diameter of the ring. You need to measure the distance between your piercing & the end of your nostril in mm would be more exact. and then add 1mm more for some room. You could do that with a mirror & a small ruler. If you are having trouble, you could ask a friend or a local piercing shop for some help. SUGGESTIONS: If you having trouble determine your size, 22Ga, 8mm ring is pretty standard size go for that and if it is not perfect, I am always willing to work with you :) If I don't get a size requirement from you, I will send the one that is listed: 22Ga, 7mm, round and continuous nose ring! Also, you can request the size of the swirl as well... If you have any questions or concerns, please feel free to contact me :) HOW TO OPEN & CLOSE RING: To open and close the ring, grab both of the ends of the ring and open it sideways enough to be able to put it in, when it is in, close the ring the same way! HOW TO CLEAN YOUR RING: It comes to you clean and polished, but like all things, it will get dirty eventually. Soap & water work or if you have a silver polishing cloth, rub both sides, then rinse. ~Thank you for stopping and supporting handmade, have a Blessed Day~ ~KR :)