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Are those really frisbees? How did you get so many of them?
As I saw it, that were caps of plastic waste bins, bought anywhere from a manufacturer (ask Tobias Berben of the DGoB for more information). But other discs with similar aerodynamic effect will be enough. In moment, I'm collecting the caps of those 5 liter plastic buckets, which are used in gastronomy. -- RueLue