2.5mm copper exterior provides unsurpassed heat conductivity. Stainless steel interior is ideal for all daily cooking needs. Cast iron handles allow for safe, permanent portability. Hand-washing is recommended to preserve the finish of your copper kitchenware. Cookware set includes a jar of CopperBrill Cleaner, which restores the polished finish to your copper pots and pans. Everything you need to set your kitchen apart is included with our Mauviel 7-piece Cookware Set. The beautiful copper cooking accessories accentuate contemporary kitchen decor. Created by Mauviel, a French company founded in 1830. Dedicated to offering products of the highest-quality, Mauviel has become a fixture in professional and household kitchens around the world.. . . . . Lifetime warranty covers any defects in materials, construction, or workmanship under normal use when following recommended care instructions. Learn more about the benefits of using copper cookware in your kitchen.