Made from an extremely clear, durable, and tough material. PET is an odor and flavor resistant thermoplastic resin, meaning it can maintain the original flavor and aroma of food and beverages placed in them. PET cups are freeze, heat, and crack resistant, which helps make them one of the most popular plastic materials in the market. Packed 20 cups per sleeve, 50 sleeves to a carton. 1000 cups per carton.