Nothing out of the ordinary, just an old uncoated caliper that will rust over time. They work as you would expect. The only thing that confuses me is that they include mismatched caliper mounting bolts. since they have the same length and thread pitch, but the screw heads were of different sizes (from 10mm to 13mm). I didn't use the included screws, so who wants to deal with mismatched head sizes on a part?