Has anyone ever made
the round plastic canvas playing card holders?
My daughter bought some at a sale the other day and I'm trying to figure out how they are done. It is very simple, I presume, except that there is a raised small circular part near the centre. How would one accomplish this. I thought first that maybe it was an extra piece inserted, but it isn't. Is it possible the the plastic canvas may have been heated and shaped over something? The outside edges are still flat. If the whole thing was heated, I think it might be hard to retain that flatness. Any ideas?