The high density is perfect for absorbing unwanted sound and reducing echoes, waves, reverberation and flutter echoes. In addition to using acoustic foam to dilute the sound, you can also use it to enhance the acoustics of a room, such as in a recording studio. Different from other acoustic panels, our Acoustic Panels with self-adhesive layer, which can be directly installed to walls, ceilings, doors, windows. Stronger installation and splicing without any tools! Perfect for professional studios, video game rooms, podcasts, home theaters, offices, etc. This sound-absorbing panel is made of polyester fiber, high-density material, formaldehyde-free and odorless, B1-class flame retardant. Safe to breathe and touch, safe for kids, adults and pets. Please feel relax to use indoors. sound proof wall panels designed with beveled edges and multi-line patterns. Which not only enhances its acoustic performance, but also beautifies its appearance. You can DIY decorate the wall surface into windmill patterns and many interesting patterns. Adhesive: random color, don't accept the specified color Colour:Black Material:polyurethane Size:about 30 x 30 x 1cm Package Contents: 12 x Acoustic Foam 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.