[Strong Self Adhesion]When you employ Adhesive Acoustic Panels, you don't have to worry about now not getting the correct glue so they consistently fall down. Adhesive Acoustic Foam are equipped with strong self adhesive at the back and you can easily install them! [High Soundproof]After testing, the NRC of Corrugated Sound Panels are as high as 0.66. It suggests that after using Soundproof Foam, you cannot solely make merry or get peace indoor, but also get pleasure from effective tune without echo! [4th-Gen Materials]Studio Foam is manufactured from the 4th-Gen polyurethane materials, which is high soundproof, high quality, high elasticity, dense anechoic holes, health, and fireplace resistant. [Professional Manufacturer]provided official soundproof recommendations for several recording studios, cinemas, piano rooms, dance rooms, theatres and families. Colour: black Material: polyurethane Size: 30 x 30 x 2.5cm Package Contents: 12 x Acoustic Foam Panels Only the above equipment content, other products are not included. Note: Light capturing and different displays could cause the color of the object within the picture somewhat different from the genuine thing. The dimension allowed error is +/- 1-3cm.