4g threaders made of work-hardened, lightweight aluminium, closed with a copper spring in your choice of 4 colours: rose gold, gunmetal, antique brass, or black coloured copper. They are designed to fit through tunnels in gauged piercings and the hoops measure approximately 2" in diameter. They look heavy but are actually quite light, weighing approximately 12g each.
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.
The last photo shows my slightly thinner, 6g Tesla Hoops available here. I also make this design in heavier-weight solid copper, which you can see here.