 They go down into the board, and then they burn in the top because it sinks a little bit. That nail sinks a little bit below the surface of the wood floor. And then they burn it. Yeah, like they burn in a spot so that you can't really see. And they did do a test area, but here's the deal. The thing is, I'm concerned that once we get those all over the floor, because even this summer we have had so many more boards that have gotten loose. I mean, you can literally depress them. It is so loud, it's insanity. And I have had out.