Calofulston 2"-4" Black Lava Rock, Large Volcanic Lava Rock For Fire Pit,, 5Lbs ?Package List?You'll get pair of gloves and 5 LB of black large lava rock in 2"-4" sizes, which are perfect for fire pits, fire tables, fireplaces, garden landscaping decoration, aquariums, terrariums, indoor and outdoor use. ?For Firestone?Black lava rock is made from lava that have cooled down years ago, which is often used as Firestone in a fire pit or mulch to dissipate heat more evenly. ?For Aquariums?Black lava rock is made from lava that have cooled down years ago, so there are lightweight because of the air pockets in them. Their lightweight makes them ideal as mulch and also can be used as a natural filter media in aquariums and ponds. ?For Garden Mulch? Lava rocks porosity allows for better drainage. It ensures water does not pool between the rocks or under them, and also can prevent soil erosion while maintaining optimal soil health and promoting natural growth, except for weeds. ?For Decoration?The black coloured pebble can be used in bathrooms as ornament, in and around entertainment areas, in prayer gardens and sanctuary's where their organic, natural finish brings a calm, serene feeling, and to contrast vibrant greenery with bright flowering.