Product review (3 stars): Cheap, but will do.
They came all bent up because the packaging is so flimsy. I reshaped them as best I could as I didn't want to go through returning and waiting for another sets of bent ones. The metal is very thin, so you can't set anything terribly heavy on them, such as a full soup kettle or pressure cooker. Overall, they do the job, as what I wanted was to cover the electric burners on the apartment stove because I don't use them. I use an induction plate that I love. I set it on top of one of them, and it works ok.