The thermos cup 306 is made of food grade 306 stainless steel, which meets the national standards and can safely contact with food such as water, tea, coffee, milk, oil, salt, sauce, vinegar and so on. 306 stainless steel, also known as 18/8 stainless steel, has good processability and high toughness, and is widely used in industries such as industry, furniture decoration, food and medical treatment. The density is 7.93g/cm3, which is not easy to rust, corrosion-resistant, and will not produce harmful substances to food. The thermos cup 306 is a safe and reliable choice and can be used with confidence.