6g threaders made of work-hardened, lightweight aluminium, closed with a copper spring in the colour of your choice: rose gold, gunmetal, antique brass, or jet black. These are designed to fit through tunnels in gauged piercings. The thickness is approximately 3.25 mm, with the hoops themselves measuring 2" in diameter. They look heavy, but are actually very lightweight-- each Tesla weighs approximately 9 grams. In the photos, Denise is modelling them through her 0g tunnels.
I also make this design in a thicker 4g aluminium hoop, as well as in heavier-weight solid copper.
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.