Yes, that is what made me think of it - Aluminum polishes easily with a little buffing.Now that you mention it, I'm not sure. I'd assumed just some other type of steel given the heft to it, but it was just corroded/oxidized looking rather than rusted like the rest of the steel parts; aluminum would explain that. Guess I'll need to find a magnet to check. If aluminum polishes up this easily, I'm going to be doing a lot more polishing on any future CNCs I build I guess
But all in all, I think the wheel looks good too...you could always have it nickle plated... but then that could add a lot of cost...