High-Efficiency Sound Absorption: The fiberglass soundproof panels is made with 100% white fiberglass liner, 2-inch/5 cm thickness, with an NRC value of up to 0.95, effectively absorbing mid-to-high frequency noise, reducing echoes and reverberation, and creating a quiet and comfortable environment for you Self-Adhesive Design: The back features a self-adhesive design with 3M strong adhesive, ensuring it won't peel off easily. Installation requires no tools, making it quick and easy, significantly saving installation time Reliable to Use: Made with 100% white fiberglass liner, no bad smell, and meet green E0 standards, ensuring safety for both breathing and skin contact, giving you peace of mind while using it Wide Application: Suitable for various places such as homes, offices, meeting rooms, recording studios, cinemas, schools, etc., meeting your different soundproofing needs Flexible Use: Each box contains 4 pcs of pure color fiberglass soundproof panels, with a single piece size of 23.62 x 11.81 inches / 60 x 30 cm,2-inch / 5 cm adhesive width, making it easy to use