Empress PET cups are made from an extremely clear, durable and tough material. PET is an odor and flavor resistant thermoplastic resin, meaning they 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. These 16-oz. cups can be paired with flat, straw slotted and dome lids that are sold separately.