Each piece of Waterless Cookware is constructed of extra heavy surgical stainless steel and guaranteed to last a lifetime. Multi-ply multi-element base construction spreads the heat quickly and evenly. Works great on all cooking surfaces including ceramic and halogen smoothtop stoves and ranges. The temperature control valves make "waterless" cooking both easier and healthier because it eliminates the need for grease or oil in cooking. To use the temperature 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 multi-ply construction allows you to stack cook with this cookware. 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. All of our Waterless Cookware sets come with a limited lifetime warranty. Before you invest up to $2000 in a set of multi-ply cookware, consider our advantages and superior features.