15 X 15 X 1 Square Industrial Pizza Stone High quality pizza and baking stones made here in the United States of America. These pizza and baking stones are Non-Glazed; lead free, and certified Non-Toxic 100% Guarantee against thermal shock and cracking during cooking or baking. Perfect for barbequing pizzas, these stones will not crack when used on the BBQ. Perfect for fast heating wood pizza and baking ovens, they will not crack during extreme cooking.