Pampered Chef Rectangular Stone 12&rdquo; x 15&rdquo; Approximately 15" x 12". For your secret homemade cookie recipes, pizzas and so much more. About Stoneware: Evenly distributes heat and draws moisture away from the surface. Retains heat, so your just-out-of-the-oven foods stay hot longer. Virtually nonporous, so it doesn't retain oils, odors or flavors. Microwave-, freezer-, and conventional and convection oven-safe, so you can cook most anything on it. Microwave-, conventional and convection oven-safe, so you can cook most anything on it. Not for the grill.......