Made with up to 40% natural mineral content blended with polypropylene, and fully recyclable, Mineral Filled Polypro Containers use far less plastic than other options, offering an earth-friendly solution for service, carry-out, or delivery. Keep food secure and fresh inside these liquid and grease resistant containers, with textured sidewall ribbing for strength and dual lock bars which click shut upon close. They are fully microwaveable for reheating foods, and stack conveniently for space saving storage.