【Firebase To Improve Flame Performance】 - These black lava rocks have natural a porous surface, which can help spread the gas dispersion in all directions to improve the flame performance. It works great as a firebase underneath fire glass for fire pit or fireplace. While, it requires very little maintenance. | 【Natural Epic Decoration】 - With an earthy, natural look, Lava Rock complements many landscapes by adding texture, color, and depth. It works well as a transitional rock between two landscapes. It also does a wonderful job as mulch in garden bedsIt to cover the entire exposed aggregate flooring effectively hiding the unseemly pipes and tubes. It adds an extra beauty as decoration for any leisure spaces like garden, lawn, walkway, fountain, terrarium, vase filler, potted plant, craft project. | 【Activate Oxygen Ions in Water and Optimize Water Feature】- Natural volcanic rocks can activate the oxygen ions in the water and promote the metabolism of plants and animals. The porous structure can absorb harmful bacteria, residues, feces and harmful heavy metal ions to keep the water in the tank clean. Especially suitable for water features, shines in swimming pools, aquariums, water gardens, ponds etc. | 【Eco-Friendly & Safe to Use】 - Non-fading, non-degrade and non-toxic, Clean burning media for indoor and outdoor use around your home or business. Works great with propane and natural gas. | 【Black Lava Rock】 - Color Available in Black, Stone size in 2.75"-5". Weight: 10 pounds.