Usage Tips: [Professional Acoustic Treatment] Acoustic foam panels adopt a novel pyramid 3D design and high-density polymer material. The contact area between the soundproof foam panels and the sound wave is increased, which can effectively reduce flutter , reverberation, standing wave and high-frequency noise. In bringing you a quiet and comfortable environment, it can also improve the purity of vocal music. [Convenient Self-Adhesive] For Acoustic wall panels, you don't need to buy additional spray glue and double-sided tape. Our soundproof foam board comes with a self-adhesive layer, tear off the kraft paper on the back and at will. The strong and long-lasting adhesive keeps the soundproof cotton firmly fixed . Easy to install, don't worry about falling off. [Rapid Expand & Recovery] Soundproof wall panels are composed of sponge polymer material, which is instantly pressed through dozens of -temperature processes. Full of elasticity and toughness, it will quickly expand and return to its old shape within 5 seconds after opening the package. No soaking, no waiting. [Multi-Scene Decoration] Soundproof foam panels with stylish and simple pyramid design, can be arranged in different interesting arrangements according to your imagination. Add more beauty and fun to your space. Our acoustic foam is suitable for homes, game rooms, recording studios, offices, and more. with adhesive backing, the color is random, no designation is accepted Colour:Black Material:Polyurethane Size:About 30x30x5cm Package Contents: 12 x Sound Proof Foam Panels Only the above package content, other products are not included. Note: Light reflection 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.