Not sure what they are made of but it is not shrink wrap. When I started the shrinking process with my heat gun, the foil started to melt. It looked like a bread box that was too close to the stove. This has never happened before when I've used shrink wrap so I was surprised but turned my heat gun down and slowly let it shrink. I noticed that the instructions suggest putting the wrapped project in the oven on paper. I've never had to do this, but I'm glad I did because the film melted on the oven rack where it met. This has never happened before. When I pulled my project out of the oven, there were huge gaps where the "shrink wrap" had melted, resulting in no pressure being applied to the print because there was literally no wrap there. I removed it and found that the translation was of poor quality due to the lack of slide and the cup was damaged. I would NOT buy this product.
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