All-Clad Stainless Butter Warmer About All-Clad For more than 40 years, All-Clad has manufactured top of the line cookware products revered by both working chefs and avid home cooks. All-Clad pieces feature an innovative blend of aluminum, copper, and steel and are made in the USA. This Pennsylvania based company regards the quality of its products with the utmost importance, going through rigorous hand inspection at every stage in the process of manufacturing. All-Clad also values environmentally friendly production, recycling materials whenever possible–they even re-use the metal dust created during sanding. All-Clad Stainless Steel All-Clad’s Stainless Cookware collection features a 3 layer system. The core layer consists of aluminum for superior heat distribution, while the magnetic steel exterior makes these pieces ideal for induction or any other type of cooktop. The innermost surface utilizes a sunburst design for enhanced non-stick qualities. Care Only use low to moderate heat settings, unless boiling because overheating can cause brown or blue stains. Use 1 to 2 teaspoons of oil or butter with these products. Use of aerosol sprays is not recommended. Do not use in broiler or oven above 500 degrees. Dishwasher safe, but hand wash recommended after each use. Do not use chlorine bleach based cleansers, or any steel based cleansing pads.