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Antenociti's sells ferns like that in brass etch (half -etch). The grasses seem to be standard railroad horsehair and tufts.
I really, really wouldn't use them for gaming bases though, they are extremely fragile, and once they're kinked they're not easy to smooth back out.
You can get thicker brass etch ferns and plants which are a bit more robust but don't look so good.
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