Exotic Fire Glass | Tumbled Black and Gray Lava Pebbles | 25 Pound Bag | 3/4-1 1/4 Inch Pebble Size | Perfect for Any Natural Gas or Propane Outdoor Fire Pit (Black/Gray);

Black Lava Pebbles are uniquely formed when hot lava emitted from an active volcano meets the ocean and hardens on contact. The pebbles are gathered from the lava fields in Indonesia and tumbled to create a consistent and more uniform shape and size. Perfect for outdoor natural gas and propane fire applications, Black Lava Pebbles radiate heat at high temperatures with cracking or crumbling like other lava rock or cinder lava on the market. Rectangular Fireplace / Fire Pit Coverage Calculator: Length x Depth x Pebble Height / 19 = Pebbles (lbs.) Round Fireplace / Fire Pit Coverage Calculator: Diameter x Diameter x Pebble Height / 24 = Pebbles (lbs.) Warning: Wet or damp lava pebbles may crack or burst upon rapid heat. Covering fire pit to keep lava pebbles dry when not in use is recommended.