Features： Specially designed to block out unwanted noise, eliminate reverb and echoes. Made from environmentally-friendly foam, friendly to human body while having great sound absorption and heat insulation effects. Wide application, suitable for using at home, KTV, studio, theater, cinema, office or other place that need acoustic control and noise reducing. 12 piece one set, easy to install, just put them on the wall, also has good decoration effect. Exquisite workmanship, lightweight and sturdy, a nice choice for you. Specifications： Color: Black, red, grey, purple, blue (optional) Material: Foam Product Size: 30 * 30 * 5cm/ 11.8 * 11.8 * 1.9inch Product Weight: 25.8g/ 0.9oz (single one) Package Size:33 * 33 * 6cm/ 12.9 * 12.9 * 2.3inch (single one) Package Weight: 310g/ 10.9oz Package List： 12 * Acoustic Foam