This set works very well in a microwave convection oven. Adding more to the oven does lower the temperature and make for a longer than usual bake time.

Trays are only 13 inches if you include the rim and slanted edge. Seems flimsy, very disappointed at a ruined dinner. The product chipped after first use.

It says stainless steel but it is a diamagnetic (non-magnetic) alloy.