Features: Style: European style Shape: square After a special treatment device, the shape of the triangular groove on the side is formed by the complex process of foaming, sound absorption, and sound insulation of the muffler The interior is full of small voids. The semi-open structure can absorb a lot of energy and for play a role in the sound attenuation of the sound wave, reducing the interference and response of the reflected sound of the cavity, and improving the purity of the sound; sound insulation and sound absorption material is a kind of High-performance products. Color: black Specifications: 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.) colour: black Material: foam size: 30*30*5cm Note: The item will be compressed to ship, if they will be some difference when u got them and can'for t be recover after 24h, please put them in the water for a for time, and then dry them by naturally, they will be recovered (the sponge will be more easily damaged after wet, please try to dry them by hand with light force.) Package includes: 24* Acoustic Panels Foam Wedges