All 4 rear calipers are the bare aluminum color w/ the occasional black discoloration. These 2 were torn down because I was going to have them sent out to powder coating but the dude backed out on me. The one dust boot that is not pictured was already torn when I got them...so, it went to the trash. The retaining clip, I've been searching for it for the past 3 days now and still can't find it. Other than that, there is nothing wrong w/ any of the materials. This is also the set that does not have the caliper hardware.
The other set of calipers, they are all in one piece, never got dismantled. Ready to be used.