The sound absorbing foam is crafted from flame-retardant and eco-friendly materials, ensuring safe usage. Wall low-frequency sound-absorbing cotton enhances sound clarity, sound absorption, and noise reduction effectively; It eliminates the first reflected sound, reduces reverberation time, and minimizes sound interference between side walls; After unsealing the vacuum packaging, soak the panels in water for 1-3 minutes, gently wring out excess water, and place them in a well-ventilated area to air dry, or use a blower for drying. Additionally, allow the soundproof panels to remain in a ventilated area for 24-72 hours. Suitable for professional studios, recording studios, voice studios, control rooms, rehearsal rooms, concert halls, podcasts, as well as for use in churches, home theaters, professional theaters, home studios, offices, utility closets, etc. Can be applied to walls, ceilings, doors, and more. Colour: black Material: Polyurethane Size: 12 x 12 x 24cm Package Contents: 12 * sound absorbing foams Only the above package content is included; other products are not part of this offer. Note: Lighting and different displays may result in slight color variations from the actual product. Measurement error is allowable within +/- 1-3cm.