can effectively eliminate echo and reverberation, and provide you with clear audio. the soundproofing panels are durable, strong and scratch-resistant. Plus, they are odorless, non-toxic, formaldehyde-free, and safe for adults, children and pets to breathe and touch! The acoustic wall panels are adhesive-backed and can be easily installed without any additional tools. Just prepare a clean and smooth wall, confirm the desired location, and then stick the acoustic panels. soundproof panels absorb unwanted sounds and at the same time play a good role in decorating the walls. Perfect for professional studios, recording studios, vloggers, game rooms, podcasts, schools, home theaters, offices, and more. With adhesive backing size: 30 x 30 x 1cm Material: polyurethane colour: White Package Contents: 15 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.