This box set is made of noncracking stainless steel containers that are leakproof Its tiny design makes it easy to carry into a briefcase schoolbag or handbag This set box durability and portability are guaranteed by its foodgrade materials Sleek in dimensions and shaped like a square Satinless Steel Discover how simple it is to go from baking or preparing to carrying freezing or storing and then to serving One multipurpose leakproof satinless steel box that can do it all Multiple Uses Perfect for both college students and working professionals the four unique tight rotator clip mechanisms and spillproof containers The containers lids are airtightThese lids not only prevent leaks but also guarantee that your fooden semiliquid stays within the lunchbox 100 Airtight Lids When you use an airtight and leakproof lid on a steel box with a silicone ring inside you may transport liquids without having to worry about leakage Because the 100 airtight lid lock keeps odors out and in your food stays fresh For total safety it is easily washed and sterilizable The ruber ring gasket makes cleaning the lid easy Furthermore the boxes are dishwasher safeUse a sponge and liquid soap to cleanAvoid harsh cleaning for extended periods of use and give each item a separate wash to avoid accidental breaking