What's in the box: 1.5 quarts covered saucepan, 3 quarts covered saucepan, open skillet, 8 quarts covered stockpot, stainless steel steamer insert fit 8 quarts stockpot What is multi-ply clad Copper? Multi-ply clad construction is a combination of a 1.8 stainless steel interior with a multi-element aluminum core and exterior polished copper. Copper is an excellent material for heat conductivity and professional chefs like to use copper cookware to have precise heat control for perfect cooking performance. Discoloration: copper polish exterior looks elegant, however copper is very sensitive, and oxygen in the air, makes it tarnished even when not in use. When heating copper cookware, discoloration happens much faster. Regular polish is needed, even not in use. Do not wash in the dishwasher, wipe dry immediately, and lightly polish use a dry cloth, water residue on the surface will make it stain and tarnish. Cookware cleaner such as "Barkeepers Friend" is recommended to polish and restore the shine of copper.