Meter.llc R-14.5 1435345345 11242343, 14.5 Inches Round, Tanter OUR THICKEST STONE--At 7/8" thick, these are nearly as thick as a quarter is wide. These hold a huge amount of heat and are perfect for multiple-pizza cooks. You will get results like those in a pizzeria. DO NOT SEASON. This stone is porous and will emit smoke and a strong odor if seasoned. Allow to season with use. Works perfectly on the grill. At 14 1/2" these are ideal for most grills. At 7/8" thickness, these have unmatched heat transfer and are very warm hours after use.