Product review (1 stars): Buyer beware! This product will destroy your oven!
I purchased these oven liners to protect the bottom of a brand new built-in double oven and make it easier to clean any messes after baking.  We used the top oven twice and the bottom oven once before realizing these oven liners had ruined our oven.  The liners actually burnt, causing them to melt the non-stick seal on the bottom of each oven.  You can see in the pictures how the liners are burnt and the damage they caused to both ovens.  The top oven had been used for 12 minutes at 425 degrees for a pizza and for another 12 minutes at 350 degrees for cookies.  The bottom oven had only been used once for 12 minutes at 350 degrees for cookies.  This is nowhere near what the product states as the limitations for heat.  Unfortunately it will be impossible to replace or fix the non-stick seal on the bottom of the ovens and they are permanently ruined because of these faulty oven liners.