Enamel cups are also a good choice. Enamel is the inorganic glass material through solidification of molten metal on a thousand degrees of composite materials. Enamel coating the metal surface can prevent rust-lined, metal expands when not in surface oxide layers and can resist the erosion of various liquids. Enamel products do not contain harmful substances such as lead, easy to carry and clean, widely used as eating utensils and washing utensils used in everyday life. Enamel cup there is a drawback, enamel Cup clash, the surface is prone to breakage. Studies have shown that damaged enamel cup drink easy precipitation of harmful substances, should be decisive out.