Made of high quality environmentally polyurethane foam, these studio foam are durable and effective, no health risks, safe to use. Acoustic foam panels feature a classic design that offers excellent sound deadening and echoes absorption.This product provides strong noise reduction , where moderate deadening is desired. 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 Office The high quality material studio foam can keep its sound insulation function permanently. In terms of cleaning, you just need to vacuum and dust them occasionally. Open the Vacuum package, put the foam panels in a ventilated place about 24-48 hours. Colour:black Material:Polyurethane Size:30x30x2.5cm Package Contents: 36x soundproofing foam Only the above package content, other products are not included. Note: Light shooting 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.