Ideal for use with most gas grills, these GrillPro Lava Rocks provide you with a great grilling experience. The natural Lava Rocks are porous, which makes them absorb heat which can then be distributed evenly for more flavourful cooking. They are self-cleaning through the burning-off process for low maintenance, and they reduce flare ups for even and thorough grilling results. The package contains seven pounds of lava rocks.