These food containers are made of high-quality borosilicate glass and have bamboo lids and silicone gaskets. The lids are NOT oven, microwave and dishwasher safe, but they are fridge safe. However, the food containers are oven safe without using the lid. They have an airtight seal and they are reusable and easy to clean. Important: When removing the container from fridge or freezer, do not introduce it in a pre-heated oven at more than 120°C. Capacity / Size / Weight: 520ml / 13 x 5.6cm / 380g; 800ml / 15 x 6cm / 450g.