The Perfect Pizza Grilling Stone utilizes heat diffusion technology for an evenly-heated cooking surface with no hot spots. When the stones lock together they form a hollow core of air which acts as a heat diffuser. Heat from the bottom stone is transferred to the circulating air inside which in turn heats the top stone evenly. The end result is a pizza that is perfectly browned, with crispy crust every time from the perfect pizza stone for grilling. These pizza stones can withstand temperatures of at least 900 degrees F. This stone is safe for both oven and grill. Features two interlocking, un-glazed cordierite stones. 14' diameter x 1.2' tall when interlocked.