Product review (4 stars): Too soon to say
Unfortunately, I have not used my oven since I received the mats, which is the reason for four rather than five stars. Having said that, they fit in my oven perfectly. I have a new electric oven with no heating coil, so I placed the mat on the lowest shelf as instructed in the paper work included. They came rolled up in a box, but laid pretty flat when I unrolled them.