The Primo Oval Fredstone is a lightweight, porous ceramic stone that helps achieve brick-oven quality pizza. The ceramic construction retains and evenly distributes heat for perfectly crisped crust. The 19″ Stone is compatible with any Kamado-style grill with a diameter of 20 inches or more.Non-Stick Porcelain CoatingFood Safe, 100% Non-ToxicHeavy Duty Ceramic Retains and Evenly Distributes HeatWithstands Temperatures Up to 2000 Degrees Fahrenheit