This 100% plastic & silicone free bento box achieves its moisture seal by adding a touch of water into the channel of the lip of the bowl. This innovative 5 ring lid design eliminates the need for any plastic or silicone that harms the earth's ecosystem. It is a groundbreaking new way to enjoy food. It holds 16 oz and measures 3” x 6”. It is microwave and dishwasher friendly ceramic pottery.