Skyflame Black Natural Tumbled Stones Round Lava Rock Pebbles for Indoor Outdoor Gas Fire Pit | Fireplaces | Garden Landscaping Decoration | Cultivation of Potted Plants | 10 Pounds | 1-2 Inch Size

These lava rocks are used for fire features like bowls, pits, and fireplaces, both indoors and outdoors. They help spread gas dispersion, retain moisture, and provide an aesthetic look.

• The description claims the rocks can withstand extreme temperatures without degrading, cracking, or crumbling.