Made of polyester fiber material, which is environmentally friendly and harmless, safe to breathe and touch,safe for adults, kids and pets.The sound proof panels have double-sided tape behind them.Easy to Install.Just rip down the first layer of double-sided tape,you can paste in wherever you want.Remarkable sound insulation effect - It can cut dowm noise and echo,protect your privacy,aviod the noise effect others.You can more enjoy the time in studio & office.Special Appearance - The minimalist design and unique hexagonal design not only improve acoustic quality but also decorate your house.Play a important role for many occasions,not only for live sound treatment on studio and office walls,also for recording studios,home studios and anywhere you needed.Adhesive: random color, don't accept the specified colorColour:B:silver greyMaterial:polyester fiberPackage Contents:12 x Acoustic PanelsOnly the above package content, other products are not included.Note: Light shooting 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.