Each piece of our World's Finest 7-Ply Steam Control cookware is constructed of extra heavy 304 surgical stainless steel and guaranteed to last a lifetime. The 7-ply construction spreads the heat quickly and evenly. The steam control valve makes waterless cooking easy and more healthy because it eliminates the need for grease or oil. To use the steam control valve, start cooking on medium heat (never use high heat). Then, when the valve begins to whistle, close the valve and turn the heat down to low and finish cooking. The 7-ply construction allows you to stack cook with this waterless cookware set. Begin cooking on individual burners and when the valve whistles, you can stack the pans to finish cooking. The phenolic handles are superbly styled and are resistant to heat, cold and detergents. This wholesale cookware set consists of a 1.7qt covered saucepan, 2.5qt covered saucepan, 3.2qt covered saucepan, 7.5qt covered roaster, 11 3/8" skillet, double boiler unit with capsule bottom so you can use as a 3qt saucepan, 5 egg cups, 5 hole utility rack and high dome cover with capsule bottom so you can use as a frying pan (cover fits skillet or roaster).