This 9", 3-compartment is made w/polypropylene material. This product is eco-friendly and heavy duty. The hinged-lid seal tight design preserves food freshness and flavor and ensures transportation safety. Best for any deli, grocery store, or restaurant take-out application. The products are microwaveable, reusable and freezer safe. It's perfect for Chinese food, salad, sandwich, Korean BBQ, etc.