Ecolite Mute AAC blocks are created with closed air pockets to act as 'sound barriers' and help provide excellent sound insulation or sound absorption with an STC (Sound Transmission Class) rating of 44. The product remains extremely simple and modular in design. Ecolite Mute blocks can also be a sound barrier wall along busy roads to insulate vehicular and other noise. The product is not expensive to replace in case of mishaps.