-adhesive-The soundproof foam panel has a -adhesive label covering the entire back, which can be easily attached to any surface. No tools or materials are required for installation. Easy to shape and cut, modification will not affect performance Reduce noise-The foam-designed acoustic panel reduces the wave amplitude by increasing air resistance and absorbing sound. It can effectively control the intermediate frequency and high frequency. Quick deployment-The soundproof foam is compressed by vacuum packaging and placed in a -ventilated place. It can quickly return to normal size in about 24-72 hours. Retardant & Environmentally Friendly-The sound insulation foam is retardant, preventing fire from spreading and reducing strength. The production material does not contain formaldehyde and is very non-toxic. It is also durable and designed to be durable Widely used: It is very suitable for live therapeutic sound on the walls of studios or offices, recording studios, control rooms, office home studios, home entertainment theaters, conference rooms, baby rooms, etc. The color of the adhesive is random and cannot be and specified size:30x30x5cm Material:Polyurethane colour:Dark gray Package Contents: 12 x Acoustic Foam Panels Only the above package content, other 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. Have a great time shopping!