Onlyfire Black Lava Rock 10 Pounds Volcanic Lava Stones For Indoor, 0.3 Inch. ?A Variety of Sizes of Lava Rock for Your Choice? - Sizes from 0.4"-0.8", 0.8"-1.2", 0.2"-0.3", 0.3"-0.6", 10 Pounds. Available in black or red with porous surface. No chemicals, fillers or colors added. ?Safe for Indoor and Outdoor Use? - Volcanic stones are heat proof and non-fading and non-toxic. It is ideal to use in fire bowls, fire pits, and fireplaces. Gas compatible, eco-friendly and safe. ?High Quality Low Maintenance? - Black fire rock can withstand extremely high temperatures without damage, degrade or crumbling. Black lava rocks are a low-cost way to achieve a fascinating burning effect and elegant look. ?Widely Used in Homes and Other Places? - Pure natural volcanic rocks are great in soil to retain the moisture of plants and animals and raise garden bed, suitable for water gardens, patios and ponds. It is also a great addition to cover the unseemly pipes and tubes, even as a base layer underneath fire glass or mixing with glass together. ?Add Lava Rock to Improve Flame Performance for Extra Effect? - These black or red fire glass have natural porous surface, which determines their superior gas fluidity. During combustion, the flame performance is improved by dispersing the gas in all directions. Both visually and ambitiously, red glass rock is a low-cost way to bring exotic fire features to you