It is recommended that you use medium to heavy-weight cookware with a flat bottom. A flat bottom pan is important because the heat radiates up through the glass top to the pan. Keeping a flat pan on the cooktop will keep the heat transfer at an appropriate level. Stainless steel, titanium, and heavy-weight aluminum pans are good, and porcelain and enamel pans are good as long as it is a thick porcelain or enamel. Avoid using cast iron pans as they can have a burr that may scratch the glass surface. Also, avoid stoneware and copper pans.