[Quick-Recovery]Be different from other foam, our products are made of the fifth generation polyurethane. The Quick-Recovery feature makes them available to be used immediately. [1.5 Inches and High Density]The sound insulation effect of acoustic panels depends on theirs thickness and density. Our products are not only made of high-density fifth generation polyurethane materials, but also thickened from 1 inch to 1.5 inches in thickness. They can effectively remove echoes and delete standing waves and flutter. [Egg Foam Padding Design Is the Most Soundproof]The experiment proved that egg carton foam is the most effective soundproofing design. The foam egg crate is perfect for professional studios, video blogger, rehearsal rooms, concert , podcasting, school, home theaters, offices, pet kennels, etc.. [Easy Installation]Our acoustic wall panels are equipped with strong self-adhesive and are easy to cut into different shapes and sizes, allowing them to be installed on various surfaces such as walls, doors, windows, ceilings, etc... P.S. The included installation manual is a universal version applicable to all (Egg Crate, Triangle, Pyramid...) or types(Non-adhesive or Adhesive). note: With adhesive, the color of the adhesive is random, Cannot be chosen the specific color. size: about 30 x 30 x 3.8cm Material: Polyurethane colour: Black Package Contents: 24 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.