These round airtight food storage containers are amazing! Once you try these, you won't want anything else. They are made from #316 (18/10) food grade Stainless Steel, (This is the best you get!) and the lid has a silicone seal. The containers are completely air tight. You can also write on the container with a non-permanent marker. This helps to specify the contents, date and owner. The bottom part of the container can be washed in the dishwasher, but the lid is not dishwasher or oven safe. This version has removable dividers. Great for adult or children's lunches. Made in Korea.