THIS 1 OF BEST I EVER USED///////// VERY STURDY EASY TO CLEAN AND HALF WHAT STORES CHARGE FOR TRASH ////// THIS IS A BARGAIN

heavy gauge steel with a quality non-stick surface, what can I say? It's a baking sheet, not a sports car.

I have now used this pan a number of time, mostly at 400 degrees or more, and it performs very well with no warping. It cleans up nicely with minimal sticking. Sure beat the old one I had.
David

I purchased this specifically because the baking sheet should not warp. I placed three small meatloafs on the tray to avoid spillage, oven set at 350 degrees. When I removed it from the oven, the tray had warped. It was advertised as having a strong, rolled edge so it would not warp. Very disappointed. Don't know procedure for returning items; may not be worth effort and cost to send it back. Also received with a dent on the tray. We wanted a warp-free tray specifically to make Yorkshire Pudding. This is the first item from Amazon that has disappointed me.

These are the best baking sheets I've ever had. The surface is large and they are heavy duty, solid construction. They clean-up very evenly. You deserve these, aren't your old ones all pitted and stained? These are a bit more expensive than some of the others but you're worth it....