1、Made of food grade silicone material, safe, non-toxic and eco-friendly. 2、Heat resistant, can be used in microwave, fridge, it id not easily broke. 3、Compact and light weight box, convenient for carry out and storage. 4、With four buckle, sealed preservation, clean and hygienic. 5、Perfect for outdoor picnic, school, work, travel or home refridgerator. This storage box is made of food grade material, very safe to use. Portable and light weight, make your daily life more convenient. Great for outdoor picnic, school, work and kitchen. Features: 1. Made of food grade silicone material, safe, non-toxic and eco-friendly.  2. Heat resistant, can be used in microwave, fridge, it is not easily broke.  3. Compact and light weight box, convenient for carry out and storage.  4. With four buckle, sealed preservation, clean and hygienic.  5. Perfect for outdoor picnic, school, work, travel or home refridgerator. Specification: Item Type: Food Storage Boxes Material: Plastic Size: Approx. 9 * 9 * 4cm / 3.5 * 3.5 * 1.6in, 11 * 11 * 5.5cm / 4.3 * 4.3 * 2.2in, 13 * 13 * 6cm / 5.1 * 5.1 * 2.4in, 15.5 * 15.5 * 8cm / 6.1 * 6.1 * 3.1in, 18 * 18 * 9cm / 7.1 * 7.1 * 3.5in Package list: 5pcs * Food Storage Boxes