These versatile storage containers are perfect for food preparation, storage and serving. The 18-piece set includes 9 plastic containers with 9 latching lids. The lids have silicone seals to prevent spills and keep your food fresh and they nest for storage when not in use. Dishwasher, microwave and freezer safe. Plastic. Set includes one 6 quart size, two 3 cup size, four 1 cup size, and two 3 ounce size. 18-Piece Set.