Black, 3/4-Inch Skyflame10Lb Natural Lava Rocks For Fire Pits, Fire Tables, Natural Lava Rock --- Made by Nature and hand picked and bagged. Lava rocks for fire pit are formed when magma rises to the surface during volcanic activity and cools on the surface High Temperature Resistance --- Lave rocks withstand extremely high temperatures with high heat retention properties, will not break down, melt or crack in high heat settings Package Details --- Each bag contains 10 pounds of Lava Rock. Each rock is the most popular size for normal uses between 3/4~1 Inch Widely Usetage --- Great for BBQ?s, Barbeques, Firepits, Fire Pit Bowls, Gas Logs, Fireplaces, Landscaping, Garden Mulch and Aquariums Multifunctional --- Improve flame performance by spreading the gas dispersion in all directions | base layer underneath fire glass or mixing with glass together | retain the heat under the cooking surface for all gas grills | great in soil to retain moisture for plants | decorative landscape lava rock for garden, patio, ponds, fish tank etc.