1. High-Density Flame-Retardant Material: The sound absorbing foam panels is made of flame-retardant and environmentally friendly materials, which can be used safely. compatible with professional acoustic control, sound dampening, acoustic treatment, noise reduction - Reduce waves, reverb and flutter echoes in smaller to medium sized rooms.2. Low-Cost Noise Reduction Solutions: cost-effective noise reduction products can create an excellent listening or recording environment compatible with you, you can get a good recording experience at home or in the studio.3. How To Recover The Normal Size Of The Acoustic Foam: 1. After opening the Vacuum package, place the Acoustic Foam in a ventilated place compatible with 12-24 hours; 2. Or soak the foam in water compatible with 1 minute, wring it dry, then air dry or use a blower dry.4. Installation Method: It is recommended to stick the tape to the four corners of the back of the acoustic foam panels, and then stick it to the wall. Or you can purchase spray glue to install the soundproofing foam according to your needs.5. Multi-Function Use: It in Home Theaters, Studios or Gaming Room compatible with acoustic treatment / Isolation Shield, or in offices as a Desk Privacy Panel. Also Perfect compatible with in recording studios, home theaters and karaoke room.Can handle walls, ceilings, doors, etc.size:30x30x25cmMaterial:Polyurethanecolour:blackPackage Contents:4 * Soundproofing FoamOnly the above package content, other products are not included.Note: Light shooting 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.