Stainless Steel Material: Thermal lunch box each container uses food grade stainless steel and PP, BPA free, so you can use hot food containers lunch box thermal over and over again, thermal lunch box is resistant to high temperature and lasting temperature. Insulation Technology: Hot food lunch box useing acuum insulation and seamless welding technology can maintain the maximum temperature no matter hot or cold, preheating or precooling before use will result in better insulation. SEALED KEEPING TECHNOLOGY: The stainless steel lunch box is locked in layers, which is delicious and nutritious, protects your diet, and warms your stomach and heart, thermal lunch box lined lid is perfectly contoured to each compartment of the tray. Heat Preservation Effect: The lunch box can generally be kept warm or refrigerated for 2 hours, this style stainless steel lunch box is leakproof, stackable, easy to clean, and safe to use, and the removable compartment design makes lunch box cleans up easily in the dishwasher. The metal food storage containers also can be used for any kind of meal preparation. Ideal for Gift: Thermal lunch container is suitable as a gift for family, neighbors, friends and colleagues on any occasion and festivals, you can enjoy home made delicacy for a healthier eating style.