With durable folded construction and rolled edges for clean release, this baking sheet from Calphalon promises a lifetime of delicious baked goods. Expertly constructed to the standards of culinary professionals, it features two interlocking layers of high-performance nonstick for beautiful results and easy serving. Warranty Information. Heavy-gauge steel. Dishwasher safe. Imported. 12" X 17" Oven safe to 500° Manufacturer's full lifetime warranty.