Frigidaire Oven safe glass container is made of high temperature resistant Borosilicate glass. A durable 4-latch system with silicon gasket creates airtight and leak proof. Food container can hold up to 1000°F. Perfect for food preservation and storage system with an open vented lids for heating purpose to keep your microwave clean and out of mess while using it. Can be used in refrigerator, freezer, Microwave, Oven & Dishwasher safe.