HIGH QUALITY MATERIAL: The kids lunch box is made of Triton material, BPA free plastic. Food-Safe Materials. Exceptional dishwasher durability helps in encouraging proper sanitation for greater plastic container safety. IDEAL PORTIONS SIZE LUNCH BOX FOR KIDS: This lunch Container has a versatile layout.4 OR 6 practical compartments portioned comfortably holds plenty of food for an elementary age kid 3-7 years. APPROPRIATELY LUNCH BOX SIZED: Container Size 21cm x 14.5cm x 4.5cm is just right so you don’t worry about packing too much or leaving too much room for containers to rattle around inside and it can pack a reasonably sized lunch for meal with this lunch box. DURABLE AND LEAK-PROOF: B&B bento box for kids is designed with drop-proof, rubber-coated edges and a unique contoured lid preventing leaks. Keeps meals and snacks fresh and mess-free during transport. Dishwasher-safe and Microwave Safe: The BPA-free plastic bento box can safely be used in the microwave and dishwasher. The tray can be placed in the microwave and reheat food for up to 3 minutes and 180℉. CAUTION: Only the inner removable transparent tray can be put in microwave & washing machine, hand wash the box and protect seal ring which helps leak proof and prolongs the service life of the lunch box.