OPTIONS : These Acoustic foam sound panelswhich can be mixed and match for aesthetic looks and design. Perfect for individuals to reduce and absorb unwanted echoes, waves, reverb and flutter echoes and wall decoration. HIGH DENSITY AND ECO-FRIENDLY: Made with Polyester Fiber, flame Retardant, it is both safe to breathe in and Contact, making it great for any location in the home or studio, it's safe for adults, kids, and pets! IMPROVED ACOUSTIC QUALITY: These noise-insulation panels are multi-purpose, it can make offices quieter and make audio recordings cleaner. And can be used for professional studios, rehearsal rooms, concert , podcasting, churches, home theaters, vocal booths, home studios, offices, man caves and more. EASY TO INSTALL: Can be installed by anyone! Simply attach adhesive to the back of each panel and adhere in the desired position. LOW-COST NOISE REDOCTION SOLUTIONS: cost-effective noise reduction products can create an excellent listening or recording environment , you can get a good recording experience or in the studio. colour: black + silver gray Material: polyester fiber cotton size: 30x30x0.9cm Package Contents: 36 x Black sound insulation board 36 x Silver gray sound insulation board 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.