T-fal Ultimate Stainless Steel 12-piece cookware set is constructed of long lasting stainless steel with a contemporary design that will look like new even after many years of cooking. The multi-layer, stainless steel base encapsulates a thick-gauge aluminum core to deliver optimal heat distribution and prevent warping. Glass lids provide the opportunity to watch food cooking, while interior measuring marks deliver added convenience and ease of use. This set is dishwasher safe and oven safe to 500 degrees.