Product review (4 stars): Fits my low-end Frigidaire branded electric stove top!
These fit perfectly in my low-end Frigidaire branded electric stove top, and I had no problem placing them in, or getting the burner to sit level. They're very thin, and very light, so I'm not sure how much porcelain is actually involved, but they do seem smoother (and hopefully easier to clean) than my old chrome ones. I was surprised how much it changed the look of my stove, for the better!