Soda glass. Wash with care. Do not use abrasive cleaners or steel wool. The sudden temperature change may break or shatter the product. Do not use the products with crack or chip as it may be broken and get injured. By characteristics of this glassware, product surface may frost or smell under high temperature and high humidity. Please wash the product with neutral detergent when it smell or frost. Product size and shape vary in each item due to the manufacturing process.