[ SOUNDPROOFING]3D acoustically designed 2-inch acoustic panels will more soundproofing as compared to thinner acoustic foam. Because thicker acoustic foam are to low-frequency sound, they do an job in absorbing flutter echoes, reverberation and standing waves. At the same time, -shaped surface design increases the contact area with sound waves, helping to up the sound waves and reduce the noise and echoes reflected from the walls [QUALITY MATERIAL] Each sound proof foam panel size is 30 x 30 x 5cm; Package- 12 Pcs,.Polyurethane soundproof foam is soft, with a clean and flat surface, So you 't worry that it will be deformed or have foam broken. Sound proof panels for walls has the features of sound absorption and insulation, retardant, tasteless, non-toxic, heat insulation, corrosion resistance, etc [EASY TO INSTALL] acoustic foam panels are lightweight and can be installed to a of different surfaces (walls, doors, windows, etc.)In case you need to fit noise dampening panels in a smaller or an odd-shaped area, you can trim as needed with regular scissors. Installation can be be done using adhesive tape or spray (not included) or you can use push pins or Buckle to hang acoustic wall panels temporarily.These panels great room treatment are easy to install [WIDELY APPLICABLE]2 inch thick sound foam are a for treating small to medium-sized rooms. These sound absorbing panels can be used alone or with bass traps to efficient sound absorption, while also dealing with standing waves and flutter echoes.They are ideal for use in professional music studios, recording booths, concert hall, theater, churches, control rooms, podcasts and home offices. size: 30 x 30 x 5cm Material: High-density spongecolour: black Package Contents: 12 x Sound insulation sponge Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. Have a great time shopping!