Terse: Polymetal/Dibond.
Verbose: Whatever they make difussers from, depending on whether it's a flat plate or complex as they tend to be,
You'll notice the pivot point is raised, such that as the floorplate deploys it swings down and forward to mate up to a rigid difusser.
Ignore the scalloped edge. That's depricated. I lean more toward fiberglass rods for bows, rather than inflatable.
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