PIONEERED HOLLOWED OUT DESIGN: These unique hexagonal acoustic panels comes with the hottest color combinations. And each set includes 2 hollow out sound insulation panels which makes it more decorative. And the size enhances sound insulation.SELF-ADHESIVE, EASY INSTALLATION: There is a self-adhesive tab covering the entire back that can easily stick to any surface. No special tools or materials are needed for installation. And you can easily cut the sound panels with a sharp knife to make different designs with the individual panels, and give full play to your creativity.EXCELLENT SOUND ABSORPTION: 9.7 lb/ft density acoustic panels can effectively absorb reverb, flutter echoes, undesirable acoustic reflections, unwanted noises and reduce waves. They are perfect for game rooms, rehearsal rooms, concert , home theaters, etc. In addition to using sound proof panels for walls to dilute the sound, you can also use it to enhance the acoustics in a room, like in a recording studio.HIGH-QUALITY & ECO-FRIENDLY: Our acoustic proof padding are made of high-density polyester fiber material, ensuring of noise reduction coefficient: 0.92 and absorption coefficient: 0.8 Besides abrasion resistance, and scratch resistance, they are odorless, safe, formaldehyde-free, and flame retardant which is both safe to breathe in and touch.Good sound absorption characteristics: If you are mixing in a studio, you must reduce the ambient sound. Unnecessary noise during recording will destroy it. The sound-absorbing board can absorb the sound produced by low frequency, middle frequency and high frequency, which is very suitable for recording.the color of the back glue is random, don 't accept the specified colorcolour: silver gray + whiteMaterial: polyester fiber cottonSize: a side length of about 17.5cmPackageContents:5 x Silver Grey Soundproof Cotton5 x White soundproof cotton1 x Silver Grey Hollow Soundproof Cotton1 x White Hollow Soundproof CottonOnly the above package content, other products are not included.Note: Light 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.