The casserole and sauce pans have tempered glass lids with steam vent and stainless steel rims, which ensures ease and allows for viewing foods during preparation. The items can also be used on gas, electric or glass ceramic (electric heating element) stoves and are dishwasher safe. Aluminum body with thickness that provides faster and more uniform cooking. Interior and exterior Starflon Max nonstick coating is easy to clean, more durable and not hamful to health, because it's PFOA-free. Tempered glass lids, with steam vent and stainless steel rim.