These nose hoops are so simple: Just twist them open, put it in, and twist is back closed. There no extra bits or fussy captive beads to deal with, and they'll stay in as long as you want them to!
316L stainless steel
Rainbow and black are ion-plated
20g or 18g
Note: It is always a good idea to check with your piercer and/or your states regulations as far as nostril piercings go to know which gauge will be right for you. An 18g will be slightly thicker than a 20g.