The cup is made of food grade 18/8 stainless steel with internal and external polished. It is BPA FREE, inodorous, durable, prevent scratch and drop-proof, which can be used over and over again. It is a good substitute for glass cup and paper cups. And they can be stacked up together to save your space.More convenient for you to storage and carry around. It is also a good drinkware for camping or hiking.
