Safe Food Grade Materials: The food cube containers are made of professional food-grade silicone material that is odorless, BPA-free, and safe for the whole family. The smooth silicone surface makes them easy to clean and dishwasher, freezer, and oven safe. Thanks to the stainless steel frame, they are not microwave safe. Reinforced Frame: The soup containers are reinforced with a stainless steel frame for extra stability, preventing the soup freezer cubes from tipping over when filled with liquid food. You can place the freezer trays in the freezer without them tipping over. Perfect Portions, Easy to Stack: The silicone soup freezer trays have two fill lines: 125 ml/4 oz and 250 ml/8 oz in each separate compartment, making portioning broths, soups, sauces, and other measured liquid foods easier and more convenient. Large Freezer Trays with Lids: The reusable silicone containers for the freezer come with a clear, tight-fitting lid that provides an airtight seal to prevent freezer odors and flavors, while being easy to open and keeping stored food fresh. Multiple Uses: Use the silicone containers to freeze food and store it in perfect portions. Perfect for freezing soups, leftovers, smoothies, sauces, broths, stews, ice cubes, baking, and more. The clear lid makes it easy to see what's inside. A must-have in every kitchen.