Some of these molds had plastic thread molded into them when they arrived which made me doubt their quality. I scraped off the plastic before using it and since then (fortunately?) I haven't noticed any problems with their material, even after baking the soufflé several times. Also, the shape makes them difficult to fold -- the bottom pieces don't fit into the top ones. Overall they seem pretty good considering the price and the fact that they work most of the time.
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