Extra Large Black Lava Rock

XXL Extra Large Lava Rock 3-9" 40 lbs Because lava rock is economical, it is the perfect choice as the first filler that goes into a very large and/or dept fire feature to cover up the gas piping and tubes. Once the lava rock is spread the way you want it, add a layer of fire glass to create a truly astonishing design that will instantly become the focal point of your home or yard. This XXL Lava Rock is great for being placed on top of your existing fill of lava rock or fire glass. Large Lava Rock Specifications Material: Lava rock Size: 3" to 9" Color: Brown to black Weight: 40 Lbs.