Product review (1 stars): Not worth it.
In order for these to be used safely and not pose a fire hazard, you must first cut them to the correct size. This is not easy to do, in spite of the slits the product comes with. The correct size, by the way, leaves a large part of the stove top between the protector and the burner uncovered, and thus exposed to dirt and burning food. The area between the burners on the right and left is of normal size on my stove, yet this area is also not covered or protected. They slide around as well, rather than keeping the hole centered around the burner. I ended up throwing them out today and am now simply using a layer of aluminum foil. Won't burn, easy to cut, and covers the whole cooking surface without gaps.