Acoustic panels have adhesive glue, which is more convenient for you to install. All you have to do is off the back film of the sound proof padding and stick each acoustic panel to the position. No tools or materials are needed Please note: do not tear off the adhesive tape on the back of the acoustic panel, when peeling off the back film on the board.With comb design, sound proof padding is great for room decoration and acoustic treatment. acoustic panels adopt beveled edge design, which can not only reduce sound, also an aesthetic appearance.Professional sound dampening panels are great for treating sound on walls in your studios or office and decorating your recording studios, control rooms, home theaters, and home offices. acoustic panels are safe to touch and breath in because of the odorless and -friendly soundproof material.Note: Backglue Random color, 't accept the specified color.size: 15cmMaterial: Polyurethanecolour: BlackPackage Contents:12 x Acoustic PanelsOnly the above package content, other are not included.Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.