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My Review, yes this really works. I did them in a 350 oven for 25 minutes. They shrunk to approximately 1.5 x 3 inches. They did not get as hard as rocks as first pinner stated, but they can be put on a key ring. Kinda of cute. Fritos, Cheetos and Funyons turned out well. Doritoes not so much. Some turned dark and I would not want to use them. First pinner: Shrinking chip bags in the oven to make key chains..loved doing this!!