Made of Cordierite and heat resistant up to 1,450℉(787℃). Unicook 12" Square Pizza Stone with Stainless Steel Rack. If you want to bake a crispy-crusted pizza in your oven or grill, consider using Unicook pizza baking stones.You can bake a crust that is crispy, with bulging edges, cracks, and blisters, and add any toppings you desire.