Add this Medium Lava Rocks - 10lbs to your fireplace or fire pit. Determine how much rock you will need for your fireplace or fire pit with our calculator. Use this medium sized rock as a filler under fire glass or as the center of attraction.
This rock is created by gas-rich eruptions, these cinders are guaranteed fire-safe. Because these rocks are naturally formed, their size varies between 1/2" and 3/4", and different shapes.