Brick Oven Mini Round Grilling Stones (8-Inch, Red, Set of 4) This set includes four (4) mini round grilling stones. This grill stones' ceramic stone material allow for even heating and absorbs moisture to deliver a delicious crust. These stones are oven safe up to 500 degrees Fahrenheit (260 degrees Celsius). These stones should be hand-washed only. Hand-wash with warm water and a mild detergent; rinse and dry immediately. These products come with a limited lifetime warranty.