Outstanding Sound Absorbing Absorb sound within rooms and stop it echoing and amplifying, ideal long-lasting, high-performance acoustic foam panels for acoustic control, sound dampening, deadening, absorbing, noise reduction to create an ideal good acoustic environment. NRC:0.92 Premium Quality Material Made of E1 level echo-friendly material with the appropriate flame retardant properties which meets CA TB 117 Standard, the high-density sound proof foam panels can be safely used as vibration/shock protection material or as part of your acoustical treatment Self-Adhesive & Wide Application Just peel off the adhesive film and stick the acoustic panels to the wall depending on sound-deadening needs in recording studios, control rooms, offices, home studios, home theaters, gaming room, vocal booth, KTV room, podcasting room, live stream space, etc. Thickening Size & Utility Design Dimension of each sound absorbing foam is 12 x 12 x 2 inches, pack of 12 pieces cover 12 sq. ft of walls, pack of 24 pieces cover 24 sq. ft of walls, 2″ soundproof wall panels are considered the industry standard; Easy to cut, buy with your acoustical solution needs on your purpose. With its greater surface area, mushroom sound proofing padding for wall's unique design have 4 sides help reducing sound like flutter echoes with extra diffusion Installation Guide 1. Vacuum compression packaged, restore to its real thickness by soaking in water for 10 munites, pressing the acoustic foam several times, squeezing out water, and then ventilating for 48-72 hours to dry. 2. Peel off self-adhesive back and stick to any clean surface easily