Body jewelry used for body piercing is based on a straight line, a type of barbell or a circle. Several people choose what is aesthetically appealing. The most common kind of ring jewelry worn is a captured bead ring, where the jewelry wire is bent nearly into a circle, and the two ends squeezed into an aptly-sized bead, holding it into place.
The curved barbell is capped with two beaded ends. It’s less of a circle than the captured bead ring and has free ends, one with a fixed close and one threaded for jewelry removal. Differences of curved barbells have been in use long enough to have their own names, including banana bar or an L-bar.