All-Natural Glass Vessels with Airtight Lids - Perfect for your Lunch Pack Freezer Safe, Non Toxic, FreeAirtight and Leak-proof & BPA free Ideal for Serving, Storing and Safe for Microwave Square Containers: 17-ounce/490ml ea. - 3 Container (3pcs glass container & 3pcs plastic lids - Total of 6pcs set) Not use for Oven Glasslock is made of tempered glass, guaranteeing excellent hardness & durability comparing with general glass and has an absolute airtight function keeping the liquid, moisture & smell inside. Specially there is no trace of harmful environmental hormone to human body in using microwave oven. These clear, stainproof glass containers feature a space saving design. Durable silicone seal provides airtight and leakproof storage. It is ideal for serving and storing, and safe for microwave cooking.