PALEO GRILLING means grilling healthy pure foods, but just as important is HOW you grill. Grilling on natural stone protects you from the carcinogens produced when fat combusts as it hits hot coals, and it is 100% natural stone - no composition stone or tile. These stones are cut directly from quarried blocks, the material is a basalt with tiny air pockets that absorb excess oils and intensify the heat. Your meat will be juicy and safely seared. So stay healthy - eat PALEO foods - grilled safely and deliciously. Basalt stones are 16x6x3/4" each - this is a set of 2 for larger grilling space on your grill.