Usage Tips: [Both Aesthetics and Functionality]The panel has been specifically developed for those situations where acoustic absorption and greater visual sophistication are required, such as office, meeting room, home office, dining room, and recording studios, Podcasting Booths, Offices, and more. By deadening unwanted sounds like echoes and noise, you can get much clearer sounds. [What's the Effect]Tiles are an easy, elegant acoustic fix for nearly any space. Thanks to the high density, the tiles are great for reducing background noise, echoes, reverberation time(RT), and decrease standing waves, improves speech intelligibility, and help increase sound clarity in a room or space. Self-Adhesive Design - The sound proof Foam panels have double-sided tape behind them.Easy to Install.Just rip down the first layer of double-sided tape,you can paste in wherever you want. Environmentally Materials - Our products are made of polyester fiber material, which is environmentally and harmless, safe to breathe and touch, safe for adults, kids and pets. You can use it with confidence. Colour:black+grey Material:Polyurethane Size:about 30 x 30 x 5cm Package Contents: 24 x Acoustic Foam Panels(with adhesive) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.