“For years, flat back earrings were only used as piercing earrings, but they’re not really wearable long term because you are pierced with a larger gauge (12 or 14 gauge), and once your ear is ...

That's the thinnest gauge for this style of hoop, and it fits in an 18-gauge septum piercing, which is the smallest hole, in diameter, that you can get. Some people get 16- or 14-gauge piercings ...