 And for a good reason because copper, one of the best conductors, that's why we use that to create the electromagnetic fields. Another interesting thing that would, you know, since we're in the Qigong summit, is that our coils have yin and yang. So a lot of people when I explained to them yin and yang, they have no idea what I'm talking about. They say, well, yin and yang, masking with feminine, but you guys know exactly what this means. So in our, some of our systems, like the Qigong three systems, they come in yin and yang and you look closely, they actually wound differently. And some people may say, okay, well, we turn it around. It's the opposite. No, it's the same. See? It goes the same direction. You turn it around. So we have one counterclockwise, one clockwise, and one zin and one yang. And this is something I discovered through my meditation and just from experimenting the coils. I say, well, what happened if I wound this way and this way and combine it together? And I realized that, hmm, it actually feels different. The yin.