What are these?

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#1
I'm one of those people who's not afraid to ask the really, really stupid questions, so here I go, lol;

What are these made of? And what are they called?
I mean; the flat and dark brown "thingie" that the pot is standing on?
Do people make these themselves? Or do you buy them from somewhere?

I think they look like thin slices of tree trunks, but I'm no stranger to being wrong :p

(random pictures from Pinterest, credits unknown)
 

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