Features: -Eco-friendly and Safety: Made of high quality environmentally polyurethane foam, these studio foam are durable and effective, no health risks, safe to use. -Noise Absorbing: Our sound foam panels can dampen and diffuse mid to low frequency sound waves inside of a room, to minimize interference, increases increasing sound clarity. -Easy to Install: These studio sound absorbing panels can be used as acoustic cover for walls, ceilings and doors, just easily attach it with staples, nails, screws, tacks or glue. -Widely Usage: Our sound dampening foam panels are great for recording studios, vocal booths, control rooms, also ideal for home theaters, professional movie theaters, concert halls and more. How To Recover The Normal Size Of The Acoustic Foam: -Method 1: After opening the Vacuum package, place the Acoustic Foam in a ventilated place for 24 to 72 hours. -Method 2: Soak the foam in water for 1 minute, wring it dry, then air dry or use a blower dry. -Recommend method 2 that make foam recover faster and more tidy. Specifications: -Material: Acoustic Foam -Size: 30 x 30 x 2.5cm, 30 x 30 x 5cm -Colour: Black Package Inclusions: -48 x Acoustic Foams Notes:-Actual colors may vary due to computer monitors displaying colors differently. -Due to the nature of the manufacturing process and manual measurement, product sizing may vary slightly.