Specification: Material: Sponge Size: 25x25x2cm Packing volume: 25x25x8cm Color: black,white,gray,blue,red,purple,yellow Features: The sponge is soft and dust-free. It is suitable for studios,KTV,etc. It uses an open-pore structure to improve sound absorption,optimize internal porosity,reduce interference and reverberation of indoor reflected sound,and improve sound purity. ​It adjusts the indoor sound field and reverberation to make the sound pleasant. It is suitable for home decoration walls,widely used in recording studios,audiovisual rooms,piano rooms,tympanum,host room,home theater,KTV,soundproof rooms,conference halls,studios,broadcasting rooms,theaters and other occasions for interior decoration. Package includes: Sponge*10 Note: 1. Manual measurement,the size will have an error of 0.5-2mm,please refer to the actual size​​. 2. Due to the difference in light and screen,the color of the product may be slightly different from the picture. Our 2 inches foam provides moderate sound control on walls or ceilings. Perfect for individuals to reduce and absorb unwanted echoes,waves,reverb and flutter echoes Made up of environmentally friendly polyurethane foam,the acoustic panels not only have effective sound absorption characteristics,but also will not cause any harm to our body Open the Vacuum package,put the foam panels in a ventilated place about 24-48 hours. Another method is soaking the foam in water for one minute then wring the foam out water,use air dry it or use a hair drye Great for spot treating sound on walls in your studio or office - For use in recording studios,control rooms,Offices home studios,home entertainment theaters,Home Offices If you're unsatisfied with this outdoor Halloween decorations for any reason,we will refund you or ship you a replacement.