Extra Large 20" Therma Bond Rectangular Pizza Stone - 

ThermaBond® pizza/baking stones are extremely durable and will not crack because of thermal shock. There is no need to "season" a new stone with oil or soak the stone in water before each use. 

To clean, scrape off any excess food with a spatula. When the stone has cooled, run it under hot water while scrubbing with a brush. Do not use soap on the stone. Pizza stones are porous and will retain the soap. The natural properties of the baking stone will cause it to darken and spot with age – do not attempt to remove this discoloration. Air-dry the stone and store inside the oven. 

Pizzacraft stones can withstand temperatures of at least 900°F.