Upgrade Self-adhesive Design make the installation more easier. You don't need to buy extra taps or spray for the sound proof panels for walls. Saving your money and time. Acoustic Foam Easy to cut with a sharp knife. Easy to install without drilling holes or buy extra tapes, just peel and stick. Perfect sound proofing padding for wall and ceiling. It is a good choice for recording studios, podcasting, vocal booths, home studios to reduce Improve recording quality. Also can be used for offices, home theaters, game rooms With adhesive backing size: One side length 17.5cm Material: polyurethane colour: C-silver gray Package Contents: 12 x soundproofing 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.