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In order to use the steam control valve on your cookware, you must begin cooking with medium heat. Never use high heat with this cookware. When you hear the value whistle, you should close it and turn the heat to low to finish your cooking. The handles are made of phenolic material that is resistant to heat and cold. World’s Finest cookware sets include covered saucepans, a double boiler, a stovetop roaster, egg poaching cups, and many other accessories. Some customers have reported that the knobs do not match the quality of the cookware, but this is an aesthetic issue as opposed to a usability problem.