and high quality, vocal ,Flutter echoes,Reverberation, issues,Standing waves Mid to High Waterproof,anti-moisture,good air permeability,Anywhere to help block sound and prevent echoes inside the room Application:Family noise control(walls,pipes,ceilings,etc.) Workplace noise control(light walls,partitions,conference rooms,etc.)Entertainment noise control(KTV rooms,walls,ceilings,floors,etc.)Industrial noise control( walls,roofs,equipment,doors,control room,etc.) Color:Black&Blue Material: foam cotton Size about: 25*25*5cm Package Contents: 12PCS * Acoustic Foam Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.