The base is made from borosilicate glass & is suitable for oven, microwave, fridge, freezer and dishwasher useThe glass base can withstand oven temperatures of up to 400°CFour locking clips ensure the container is 100% airtightSilicone seal ensures that the container is leak proofLid & seal are BPA freeStylish enough to serve from oven to tableDoes not stain or retain odoursPlastic lid is not suitable for oven useLid has a pressure release flap for microwave cooking