This food storage set has oven-safe glass lids that can be used in the oven, microwave, and dishwasher. It is made of tempered glass and is freezer-safe up to 425 degrees Fahrenheit. The price drops from $50.00 to $39.99 to just $27.99 when you apply the code "FRIEND" during checkout. Free shipping on orders over $49, otherwise it adds $10.95.