It's a rubber extrusion. Two flaps with kind of a bead along one edge that keys into the sheetmetal.
One tip, the 3 cars I have done these on all had the ends of the metal channel staked after the rubber was installed.
You will want to slightly open up the metal at the end(s) to let the new seal slide in.
I used large channel lock pliers to lightly re-stake/crimp after the new seal was installed.
If anything, make the seals a little long as they will shrink some over time.
Cooper
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