I also received one of these stems with my order along with some other extras. It brings me a lot of joy and I really appreciate how George and the Dynavap team go out of their way to make their customers happy. I'm not sure what metal this is yet, but I think it's f'n gorgeous and has a really cool textured feel to it.
I also bought a new Hydrovong stem, and I can definitely tell an improved airflow compared to my much older generation vong stem. It's also a work of art, sometimes I catch myself staring at it, maybe copping a feel or two, just appreciating all its curves and...ok I'll stop now. Here it is with the rest of the team:
Anyway, thanks again Dynavap team for the gifts and for being just generally awesome!