Describe
<br />Specification:
<br />Total Size: 30 * 30 *2. 5cm (1" x 12" x 12")
<br />Material: Polyurethane foam
<br />Color: Black/  / Purple BLACK /  Burgundy / Red+Purple/  Purple+blue/    Purple/ red  
<br />Package included：
<br />48pcs /24pcs
<br />Feature:
<br />Using polyurethane foam material.
<br />After special treatment device side triangular groove shape formed by the complex process of foaming silencer, sound-absorbing, sound insulation, shock absorption sponge materials.
<br />Its interior is full of small voids and semi-open pore structure can absorb a lot of energy incident on the acoustic attenuation of sound waves play a role, reducing chamber reflected sound interference and response, improve the purity of sound; noise sound-absorbing material is a high-performance product.