Glasslock delivers the flexibility of using one container for the microwave, freezer, dishwasher, and oven. Odor-free, stain-proof, and airplus liquid tight, the easy latching lids bring more convenience in storing your food. Glasslock is made of silica, soda ash, limestone, and other natural components, making it eco-friendly and recyclable. It is BPA free and does not contain any harmful environmental hormones.