No diablo the stock thumb throttle.

I'm not too sure if that is paint either. I have one that I bought from a member on here that was all polished up. He told me he actually had to use sand paper & a sanding cone on a Dremel tool to get the paint off. That leads me to believe it might be an anodized coating as well. The bad part is that it only holds it's shine for about a day. You may want to try paint or powder coat on yours.