lunch box is made of high quality food grade silicone, non-toxic, Better SAFE than general plastic material. Suitable for microwaves and refrigerators, safe for your healthy. Our snap on lids create an airtight vacuum seal that will keep your food secured and fresher longer.Our temperature resistant silicone makes them microwave and freezer safe. Great for storing leftovers in the fridge and microwavable for when you're ready to enjoy your meal.