Seven layer Multi-Ply with brushed 18/10 stainless steel surfaces, they can be used on any cooking surface, including induction, and are oven-safe up to 640°F. Aluminum core provides quick, even heat distribution. Ergonomic, cast stainless steel stay-cool handle has a cut-out vent and is secured with stainless steel rivets. Extra-large lid handle provides increased clearance for fingers. Extra-large helper handle is easy to grasp, even with potholders. Hand washing recommended. Lifetime warranty against manufacturing defects. Designed in USA, crafted in Belgium.