sound proof foam panels comes with self-adhesive, rip down double-sided tape on the back and attach it . Do not need to buy additional double-sided tape. The strong and long-lasting adhesive keeps the acoustic wall panels firmly fixed . acoustic panels will recover within 5 seconds after opening the package. Do not need to wait 2-3 days and greatly save your time! sound proof panels for walls is larger and thicker than traditional one-inch acoustic panels sound absorbing, making it easier to install and reducing the risk of spaces or unsightly seams caused by installation errors. With a 2-inch pyramid 3D acoustic design, it effectively enhances sound insulation and reduces external noise. Noise cancelling wall panels is Perfect for homes or studios, helping to reduce reverberation, vibration , and unnecessary reflections. acoustic foam are made of environmentally friendly and fire-retardant material, it safe for any location in the home or studio. There may be a slight temporary smell when opened, which is normal and harmless and will go soon. Colour:black Material:polyester fiber Size:about 60 x 30 x 5cm Package Contents: 6 x Acoustic 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.