Product review (2 stars): I wouldn't buy these again
Mother alwsys said you get what you pay for, just figured I'd get a tad better quality than what I just unwrapped.  These are not Mainstay, first off.  I tend to be happy with Mainstay products and that's why I bought these.  These are a generic off-brand.  They were in a plastic bag in a padded envelope so they were banged up and had to be reshaped before they could be used.  They don't cover the entire burner bowl, they don't stay siiting in the bottom of the burner bowl.  They're so lightweight that they just float above the metal bowl.  I finally gave up and shoved them down and forced them against the metal to cover the rusted bottom.  Not like they're going to last long enough to be concerned about too much anyways.