Produced by environmentally polyurethane foam. In order to improve the specific acoustic characteristics, make it not only has the sound absorption characteristics, but also without any harm to human body.<br/>Features:<br />Suitable for sound recording studio, listening room, home theater, KTV, and all kinds of public places.<br />The sponge is the perfect sound insulation, sound-absorbing material.<br />Sound-absorbing sponge is on the basis of sponge for further processing, acoustic inside the sponge and reflection of the increase in the number so as to achieve the noise, sound-absorbing effect.<br />It not only has the sound absorption characteristics, but also without any harm to human body.<br/>Specifications:<br />Color: black, red, blue (optional)<br />Material: sponge<br />Item size: 300 * 300 * 15mm / 11.8 * 11.8 * 0.6in<br />Package size: 330 * 330 * 80mm / 13.0 * 13.0 * 3.1in<br />Package weight: 432g / 1.0lb<br/>Packing List:<br />24 * Noise Insulation Sponge