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Id be willing to bet the caps are Not Stainless . I have a friend trying to reproduce hubcaps for last 3 years that came original in stainless with no luck . The fact that the magnet doesn't stick tells me they are still brass. There were TWO vendors making these. The one I posted with the more correct size bowtie I can positively say IS brass as you can see its brass from the back , this manufacturer I knew personally and bought his remaining hubcap inventory before he retired . Theres always a spot that the chrome does not cover during the plating process . Also , at the time I wrote that thread , the grossly disproportioned bowtie 66 hubcap that is still available, I had in my possession, It had the same style brass spot under the chrome on the back . The picture that the one company shows of the back, now, looks painted silver which the earlier repros did not have. I cant tell you how many times I read "Stainless Steal Trim" when something is actually Aluminum. Personally , I would doubt the description that states "Stamped Steel" till I have one in my hand .