[Differences] The biggest difference from other acoustic panels on the market is our panels have -adhesive. Are you still worried about finding tape all over the world? If you have tried our acoustic foam panels before, you will know how easy it is to install.[Higher density is better] A density of 20 lbs/sqft3 can absorb unnecessary sounds and reduce unnecessary echoes, waves, reverberations and floating echoes. In addition to using sound insulation foam to dilute the sound, it can also enhance the acoustic effect in rooms such as recording studios.[ decoration] This unique hexagonal soundproof wall panel is designed with beveled edges, and you can it on the room or apartment like art or decoration. These curtains are usually very light and come in various colors to match your decoration.[Safety material covers a area] It is made of polyurethane, -retardant, odorless, safe to and contact. The 12 packs cover 7.5 feet and are easy to cut with a knife. Individual panels form different to form larger panels.Colour: blackMaterial: polyurethaneSize: 15x26x30cmPackage Contents:12 * Acoustic Foam Panels (with adhesive)Only the above package content, other products are not included.Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.