Volcanic Stones from American Fyre Designs provide a rocky look and give off a beautiful red glow after they burn for a while. These unique stones are great for adding an island fire look to your backyard fire pit. Volcanic Lava Stones provide a high quality natural fire media and are great addition to any fire feature. Volcanic Stones available in 25 lbs or 12 lbs. Stones average approximately 4 to 5 inches each.