1/4" - 1/2" Small Black Lava Rock

All lava rocks from American Fireglass are sifted, sorted, and packed by hand. This way, they are top quality guaranteed, they can be used in a fire pit, and have no left-over gas pockets that could burst. For optimal results, we recommend pouring a minimum of two inches of lava rock over the fire pit burner, which allows the gas and flame to filter evenly through the lava rocks.  Product Details Material: Lava rock Size: ⅛" to ½" in diameter Color: Brown to black Weight: 10 Lbs Packaging Dimensions (L x W x H): 14" x 14" x 10"