My friend had this frame color on his prescription Eye Jackets, I was very envious of them. They also have a cool name which happens to not describe them at all.

A little darker than FMJ gunmetal. My theory is that they're actually the same formula basically, but slightly different by generation, much like X-Metal plasma differs generation to generation. A fine frame finish.

I have this on the eye jacket and its basically the same colour as pencil lead once you scribble on paper.
a dark blacky grey.