This is a set of 3 packs of 350 aluminum bento cups, for a total of 1050 cups. These aluminum cups can be used as bento cups, for baking, or for experiments, and as aluminum foil. - Quantity: 3 packs of 350 cups each (1050 total) - Material: Aluminum - Uses: Bento cups Thank you for viewing. I am selling these because I have a surplus of aluminum foil cups from a Costco "Lunch Cup Set." I ended up with a case of 1050 cups. The aluminum cups are unused and unopened, with 350 cups per pack. I will ship all 3 packs together in a case. If you use aluminum cups frequently, why not buy in bulk? ~ The following is an excerpt from the Costco product description regarding the aluminum cups: Product Name: Lunch Cup Set [Aluminum Cups] Number of cups: 350 Material: Aluminum foil Heat resistance: 660°C [Aluminum Cups] If you wrap acidic or salty foods such as pickled plums, miso, or soy sauce for a long time, they may discolor or corrode, causing holes. When using in a microwave, please check the microwave's instruction manual.