Replaces
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Not sure exactly, but other sources like Advanced Auto parts show that the material is steel. I thought the copper color finish was questionable as to what the composition was… Nonetheless, these manifold studs are actually holding very well since I replaced both exhaust manifolds on my F150 last year. The only thing that threw me off was the temporary slight exhaust leak for a couple months after replacing manifolds. Could’ve been the Dorman exhaust manifolds I used… But now, it’s as quiet as can be so I’m happy with the purchase. I agree with the inclusion (or lack) of material for this product in the description. It wouldn’t hurt to say.
It’s only a set of 8 studs with nuts so I had to buy 2 packs (enough for one side).