Usage Tips:Excellent Soundproof Performance: Our upgraded soundproof wall panels are made from polyurethane, better soundproofing performance. They are perfect for various acoustic treatment needs, effectively removing echoes, eliminating standing waves, and greatly enhancing sound clarity. Safe to Use: Crafted with premium polyurethane, these acoustic panels are odorless, flame retardant, formaldehyde-free, non-, safe to breathe and touch for adults, children, and pets. Easy Installation: No extra tools required, the self-adhesive acoustic panels can be applied to walls, doors, windows, and ceilings with ease. (If you need to remove the noise reduction panels, you can remove it by heating it with a hair dryer. No damage to the wall.) DIY and Wide Use: With beveled edge and multi-line design, the sound dampening panels can be cut into different sizes and shapes to suit various spaces like studios, home theaters, offices, pet enclosures, game room, podcasting, school, etc. note: With adhesive, adhesive is random color, Cannot be chosen the specific color. size: About 30 x 30 x 1cm Material: polyurethane colour: black 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.