These borosilicate glass food containers that are made of high quality borosilicate glass and have bamboo lids and silicone gaskets. The lids are NOT oven-safe, microwave-safe and dishwasher-safe but it are fridge safe. However, the food containers are oven-safe without using the lid. They have an airtight seal and can be reusable and is 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. Capacities/Sizes/ Weights: 520ml/13 x 5.6cm/380 g; 800ml/15 x 6cm/450g.