Product review (5 stars): Do you love a clean oven?
If you love to bake, these are definitely for you!  These fit perfectly on the bottom of my 30" oven and collect all the spill overs from pies, cookies and bubbling casseroles.  Clean up is so easy, you just wipe them clean with with hot water and a dishcloth.  If you want to use these with your cookie sheets, you can just cut them to fit and they work like a dream.  I intend to try them with my gas grill for doing vegetables that usually fall through the grates such as asparagus and peppers.  They are made with similar products to Teflon so you know that they are wonderful in aiding in non-stick.
I did receive these at a reduced rate and they have been a real benefit in saving me time in clean ups.