This 15-inch pizza stone is made from high-fired refractory ceramics and has a stainless steel tray that elevates the stone, so you can evenly bake a pizza or even desserts! This stone is specifically designed for Blaze Professional grills and tray sits on the ledges inside the grill where the cooking grates sit. The cooking grid must be removed to set this tray on the ledge. It can also rest on top of the cooking grids of other brands of gas grills. The stone is resistant to thermal shock so it will not crack if exposed to extreme temperature changes. Not for use with Blaze Original Grills.