HAOYI [Easy To Install]Self-Adhesive Design, with glue on the back, easy to install on walls, ceilings, and walls. Suitable for various smooth surfaces. You don't need to prepare extra adhesives or tools to fix it on. [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. [Specification]High Density - 200kg/m3; Dimensions - 12 x 12 x 0.4 inches (30 x 30 x 0.9 cm), pack of 12, covering 12 square feet; Weight - 3.3 pounds of 12 pieces; [Why Acoustics are Important]It's no surprise that excessive noise and poor acoustics can have a detrimental effect on productivity, communication, and concentration. To solve this problem, please choose the right amount of tiles and wall covering areas to create a suitable and comfortable acoustic environment for you, your work partners, and your family. Colour:White Material:Polyurethane Size:30 x 30 x 1cm Package Contents: 12 x Acoustic Foam Panels 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.