Package included：12 x Charcoal Acoustic Wedge FoamSpecification:Total Size: 30 * 30 * 5cm (12"*12"*2")Thickness: bottom 1.5cm， slot height 3.5cmMaterial: Polyurethane foamColor: BlackFeature:Using polyurethane foam material.After special treatment device side triangular groove shape formed by the complex process of foaming silencer， sound-absorbing， sound insulation， shock absorption sponge materials.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.Application:? Family noise control (walls， pipes， ceilings， etc.)? entertainment noise control (KTV rooms， walls， ceilings， floors， etc.)? workplace noise control (light walls， partitions， conference rooms， etc.)? Industrial noise control (factory walls， roofs， equipment， doors， control room， etc.)