12 packs acoustic foam, grooved sound board, high density acoustic board, for acoustic treatment and wall decoration, 30X30x5cmDouble with adhesive one side included-Our unique groove acoustic panels comes with sticky tape on both sides, which work well with walls. It is very easy to shape and cut to size, even a green hand can easily mount these sound panels on the wall or ceilingUnique groove design 3D-these acoustic foam panels are cut in a unique pattern, making them definitely stand out compared to traditional acoustic foam. They are also well cut so that they all fit perfectly next to each other. The groove design of the panels has a wider area of sound, which means that it inherently traps a surprising amount of sound. Simply place these panels where the sound waves will hit them as if in front of a speaker or voice. Specifications-These black acoustic panels are 12x12 inches long and wide and 2 inches at the highest point. Each package comes with 12 pack panels that cover 12 square feet, and each individual panel covers 1 square meter. There are 2 interlocking panels bouncing off each other. They are high density – 25kg/m3, fireproof and made of non-toxic polyurethane foam, with no risk to health. Rapid Expansion - These panels come in a compressed sealed pouch, usually quickly roll up to full shape and size when separated