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Title: Cookie pan warps at low temperature
Review: I was optimistic when I received these pans, as they seemed well made and the materials were quite sturdy. The size of the pans was great. They would fit perfectly in my toaster oven. However, the first time I used the cookie sheet at 325F, the pan warped. I did not expect this, as the pan feels quite thick and has a weight to it. Also the wire rack that can be used in either the cookie sheet or the cake pan rocks when placed in either pan. I have not used the other two pans (muffin tin and cake pan as of yet, so I can't comment on how they react to heat.
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