Upgrade your meal prep game with this 8 - piece set of glass storage containers. Each set includes 4 3 - cup round glass containers with lids. Made from BPA - Free high boron silicon glass, these containers are food - grade and explosion - proof, boasting a low thermal expansion coefficient for strong fracture resistance. The airtight lids with 4 locking tabs and a BPA - free seal ring, along with an air valve for easy opening, keep your food fresh and prevent leaks. They're suitable for various appliances like the fridge, freezer, oven, microwave, and dishwasher, and can withstand extreme temperatures from - 40°F to 752°F. Whether you're prepping meals for the week, storing leftovers, or reheating lunch, these containers offer a convenient, healthy, and space - saving solution for your kitchen. Material: Plastic.