This set includes an 8" x 8" and a 9" x 13" dish made from borosilicate glass, these dishes resist temperature changes and prevent leaching, odours, and staining. They are safe for use in the freezer, oven, and microwave (without lids) and are dishwasher safe. The price drops from $24.98 to $12.07. Shipping is free on orders over $35 or it adds $6.99.