Safe Eco Friendly Material (BPA-free) This material is eco friendly. It is safe from endocrine disrupter(BPA-free) by using proven quality stainless steel 18-8 (27 kinds / POSCO). And resource recycling efficiency is easy even when product life is over. All raw materials used in DKINZ airtight containers are from Korea, and the entire process is managed and produced in Korea. It is a product of 'Korea' that you can trust and use. Suitable for Maintaining Freshness Material Stainless steel is a material with a higher thermal conductivity than glass or plastic materials. When used in general refrigerators and freezers, it can quickly transfer cold air to the contents and keep the temperature stable. So it is the most suitable airtight container material for maintaining freshness of contents and long-term storage Hygienic and Washable Material Strong corrosion resistance of stainless steel is strong against salinity, rust, and pollution. And especially it has an excellent advantage to prevent stain and smell of various contents (food). It is easy and convenient to clean because the risk of damage and deformation is low compared to other materials. And High-temperature automatic dishwasher and hot water disinfection are also possible, making it possible to use and manage more hygienically.