2Pcs Large Square Foam Block for Corner Audio Bass Trap Acoustic Foam Studio Sound Absorption Treatment Panels, 30X30x30cm High Density Fireproof Material: Sound-absorbing foam panels are made of flame-retardant and environmentally friendly materials that are safe to use. At the same time, it can also improve sound quality: by absorbing harmful sounds, reducing fluctuations, reverberation and vibrating echo, useful sounds are clearer. Low-cost noise reduction solutions: Cost-effective noise reduction products can create a perfect listening or recording environment for you, you can get a good recording experience at home or in the studio. Installation method: it is recommended to stick the tape on the four corners and the middle of the back of the acoustic foam panels, and then stick it on the wall. Or you can buy spray glue to install the sound-absorbing foam according to your needs. Suitable for professional studio, recording studio, voice studio, control room, rehearsal room, concert hall, podcast, etc., also can be used for church, home theater, professional theater, home studio, office, utility cabinet, etc. It can handle walls, ceilings, doors, etc. How to recover normal size acoustic foam: 1. After opening the vacuum package, place the acoustic foam in a ventilated area for 12-24 hours. 2. Or soak the wetsuit in water for 1 minute, wring it dry, then air dry or use a blow