The casserole set is composed of food-grade plastic (BPA-free and FDA approved). Inside, high-grade stainless steel is used with PUFF insulation to keep food warm and fresh for longer periods of time.The casserole's many sizes make it suitable for serving a variety of cuisines.::It can be used to manufacture curds and is portable and easy to store.Made entirely of food-grade virgin plastic. Hygienic and odorless. BPA-free, FDA approved:The shape is unique and elegant.