Pyrex glass is dishwasher, refrigerator, microwave, pre-heated oven, and freezer safe; lids are BPA-free and top rack dishwasher and microwave safe.DO NOT use on or under a flame or other direct heat source, including on a stove top, under a broiler, on a grill or in a toaster oven Airtight, secure-fitting lids to keep food fresher longer. Pyrex glass is non-porous, so it wont absorb food odors, flavors, or stains. You can choose from various shapes and sizes, depending on your food storage needs, and they are easily stackable to save kitchen space.