[Strong Self Adhesion]When you use Adhesive Acoustic Panels, you 't have to worry about not the right glue so that they always fall down. Adhesive Acoustic Foam are equipped with strong self adhesive on the back and you can easily install them! [High Soundproof]After testing, the of Sound Panels are as high as 0.66. It means that after using Soundproof Foam, you can not only make merry or get peace indoor, but also enjoy high quality music without ! [4th-Gen Materials]Studio Foam is made of the 4th-Gen polyurethane materials, which is high soundproof, high quality, high elasticity, dense anechoic holes, health, and fire resistant. [Professional Manufacturer]provided professional soundproof solutions for a number of 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 package content, other products are not included. Note: Light 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.