This set of 2 round food containers, Agatha Model, is made of high-quality borosilicate glass that withstands extreme temperatures. They have polypropylene lids and a silicone gasket. These food containers are oven-safe (up to 420 °C) 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. Capacity / Size / Weight: 620ml / 15x5.9cm / 380g; 950ml / 17.2x6.5cm / 530g.