Ground 'box' what's in them?

Inside?
Ifor the manufacturer huge, no wait, mega huge profit and for the buyer... A lot of hope :-). And a piece of metal with some screws and some wire and, very important, the Black Box...inside? All you can imagine...

And, very important, you will get tremendous impovement when you use Stillpoints below it ...

07-01-15: Ozzy
I wish some daring (rich) individual would take one apart...

Very rare. A few years back a friend of mine bought some very expensive P*D cables, forgot the name but it was something about 3-4k per meter, after a while he wanted better connectors and opened the cable. Guess what he found? Belden computer cables, thin, cheap, surrounded by big foam. He was really mad about that... the question is: Do you really want to know what you have bought?