Soda glass, Brass. Do not use abrasive cleansers or steel wool. By characteristics of this glassware, the product may contain tiny air bubbles and black dots. By characteristics of this glassware, the product surface may frost or smell under high temperature and high humidity. Please wash the product with neutral detergent when it smells or frost. Product size and shape varies in each item due to the manufacturing process. Slight scratches, darkening, or dents may be found on brass. Do not leave brass wet as humidity may cause the color to change. With continued use, the color of the brass surface will change due to oxidation. To clean the brass, use a metal cleaner and follow its directions.