AM PS1575 RoundAM pS1416 RectangularHeavy duty stones fit commercial and home ovens. Perfect for small restaurants and bars that serve pizzas without pizza ovens. 12 inch thick stone is great for breads, pizzas, etc. Keeps pizzas warm in heated display cases. Made of cordierite a no lead fire brick material. FDA approved for oven use. Available round 15 34 diameter, 11 Lbs or rectangular 14 x 16, 12 Lbs.