Butler Arts 0.50 cu. ft. 40 lb. 3 in. to 5 in. Black Mexican Beach Lava Rock Item Weight:40 allowing easy access to the allowing easy access to the deck and engine for quick and ease of maintenance 25 Features Backing Dry Back Pieces per Carton 1 Commercial Residential Commercial Residential Protective Wear Layer Rubber Construction Type Rubber Sample Available No Edge Type Straight edge Floating No Scratch Resistant No For Use Over Concrete Yes Self Adhesive No For Use Over Cork Underlayment Yes Sold As Piece For Use Over Tile No Stain Resistant No For Use Over Vinyl No Style Traditional For Use Over Wood Yes Sub Floor Surface Wood or concrete Gloss Level Medium Textured No Groutable No Use Location Indoor Installation Type Glue down Warranty 1 year limited Luxury Vinyl Tile No Wear Layer Durability Light traffic (0 5 ) 3 Manufacturer Warranty N A Black Mexican Beach Lava Rock starts as molten lava heated from the depths of the earth and is slowly cooled in mother nature’s ocean off of the beaches of Mexico