[AIRTIGHT LIDS]: Flexible BPA free plastic lids closely fit the bowls, keep food fresh, tight fitting lids are great for food storage, great choice for storing food for longer. [DISHWASHER AND OVEN SAFE ]:The glass nesting bowls with lids are simple to clean by hand and are dishwasher safe.There temperature resistance range：24.8℉ - 752 ℉ (-4℃ - 400℃).