Product review (3 stars): Worked but could have been packaged better
I bought these for canning season. The high heat for canning often turned my glass top on my gas stove brown that required a lot of scrubbing to get it clean again. These worked well keeping the glass from turning brown (there was a little browning), but they tended to slide around and cutting them to fit around the burners was not easy.

When they arrived they were crimped, folded and a bit mutilated because the packaging was just a plastic envelope. I used an iron to try and straighten them out, but that only helped a little. If they had been packaged better - perhaps in a box - and not all bent they may have worked out better on my stove.