12g threaders closed with a spring. Your choice of 3 variations: bronze with rose gold-coloured spring, antique copper with black wire spring, or antique copper with a matching antiqued spring. These are designed to fit through tunnels in gauged piercings and measure 2" in diameter. They are lightweight, with each hoop weighing approximately 3 grams (0.1 ounces). I am modelling these through my 00g tunnels.
Named after the great inventor and showman, Nikolai Tesla. Here's a quick video showing how to take off and put on my Tesla coil hoops.