The Pyrex Cook and Freeze range has been designed to make life easier. Pyrex Cook and Freeze is made from borosilicate glass with a thermal shock of 220 degrees. This means is can go straight from a freezer at -20 degrees to an oven at 200 degrees. The range can also support extreme temperatures from -40 degrees to 300 degrees. This makes the Pyrex Cook & Freeze range ideal for prepping meals in advance and freezing or simply for freezing leftovers for later in the week. Those meals can then be placed in the oven or the microwave and reheated without having to switch containers. Pyrex Cook and Freeze containers are BPA free, including the lid and are designed with no handles to make them easier to store in the fridge or freezer, where space is precious! For great convenience these containers are fridge, freezer, oven, microwave and dishwasher safe - although the lid should be removed before reheating. The containers are also scratch proof and come with a 10 year warranty for extra piece of mind. It couldn’t be easier to cook and store with Pyrex.