Lunch Box Is Made Of 304 Stainless Steel And Food Grade Material, Which Is Healthy And Durable. We Use Thicker Materials That Are Not Easy To Break The Top And The Bottom Are Very Strong . This Stainless Tray Is Removable, Can Be Cleaned Up Easily. The Lid Fits Tightly To The Stainless-Steel Tray So Food Do Not Run For One Compartment To Another. Another Useful Functions You Can Pour Some Hot Water Before You Eat To Heat The Food. 4Compartment Can Fully Accommodate The Nutritional's Need For Kids School Lunch. This Lunch Box Includes One Spoon, One Fork, Four Side Lock, And Breathable Button Design.