The Adcraft PZPS1575 14 3/4" Round Pizza Stone is made of Cordierite, a no lead fire brick material that is approved for commercial oven use. Pizza stones duplicate the results of old stone ovens and are the perfect medium for producing crispy crusted stone oven pizzas, breads and rolls. The Adcraft pizza stone heats evenly, has high heat retention, withstands thermal shock and won't crack when changing temperature. Order a few for your commercial kitchen, bakery or pizza shop today.