Ghost - This is what I know about Devaut's bolts from talking to him.
They're a brownish color 'cause he uses a Delrin that will not shrink/expand/whatever... and that people are kinda touchy about such things like that. So he's thinking, or was thinking, about making an aluminum back so that the exposed part was more aesthetically pleasing. The cost right now is $40, but if he goes to an alternate design like the aluminum combo, the price will go up. If I'm not mistaken, it's open faced, and uses an evo push pin. Not sure about the latter, put pretty sure about the face of it.