High quality ovenproof borosilicate glass. Temperature resistant from -20°C - +400°C. Transparent lid with silicone seal. 100% airtight and watertight. Cans close absolutely odorless. Lids are temperature resistant from -40°C - +200°C. Dishwasher safe. Oven and microwave safe (without lid) Suitable for refrigerator and freezer.