Usage Tips:Acoustic foam panels are made of high-density polymer material with innovative U-shaped design.The U-shaped design bounces back the noise and effectively reduces floating echoes, reverberation, standing waves, and high-frequency noise. While bringing you a quiet and comfortable environment, it can also improves the purity of vocal music. soundproof wall panels are composed of polyurethane, Full of elasticity and toughness, it quickly expand and return to its old shape within 5 seconds after opening the package. No soaking, no waiting. For soundproof wall panels, you don't need to buy extra adhesive and double-sided tape. Our acoustic foam panels come with a self-adhesive layer that can be applied at by removing the kraft paper on the back. The strong, long-lasting adhesive holds the acoustic foam firmly to the wall. Easy to install, no need to worry about falling off. acoustic foam panels absorb echoes and noise from surrounding areas while offering us with a harmonious and elegant atmosphere. Perfect for professional studios, video blogger,rehearsal rooms, concert , podcasting, school,home theaters, offices,gaming room,etc. More sound foam panels and the effect are better. Note:With adhesive backing, the color of the adhesive backing is random and cannot be specified. Colour:Black Material:polyurethane Size:About 30x30x2.5cm Package Contents: 24 x Acoustic 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.