Play a important role for many occasions, not live sound treatment on studio and office walls, also for recording studios, home studios and anywhere you needed. Made of Polyurethane material, which is environmentally friendly and harmless, safe to breathe and touch, safe for adults, kids and pets.You can use it with confidence. This acoustic panels multiple color which can be mixed and matched.Also a of stitching methods, unlock different jigsaw puzzle games. It can cut dowm noise and , protect your privacy, aviod the noise effect others.You can more enjoy the time in studio & office. 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. Note: Backing colour random, Cannot be chosen the specific color. Material: Polyurethane Colours: Black Package Contents: 20 x Acoustic 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.