If I recall correctly, they are Carr brand(discontinued model) and they are an aluminum alloy, so no issues. They aren't polished but I think they were sealed? That and I didn't bother painting the supports. I lucked into them on Craigslist looking at a different type(too long) he had for sale and saw he had these on his truck. He said he was taking them off soon and I told him to call me. I'll see if I can get you a close up tomorrow.