Feature: 1. High-density design, can effectively block out unwanted noise, eliminate reverb and echoes. 2. Made from environmentally-friendly foam, has great sound absorption, fireproof and burning retarding properties. 3. Wide application, can be used at home, studio, theater, cinema, office or other place that need to reduce noise and prevent fire. 4. Easy to use, just put them between walls and ceilings, mounting them horizontally is also a good idea. 5. Exquisite workmanship, unique bass traps design, lightweight and sturdy, this is a nice choice for you. Specification: Features： High-density design, can effectively block out unwanted noise, eliminate reverb and echoes. Made from environmentally-friendly foam, has great sound absorption, fireproof and burning retarding properties. Wide application, can be used at home, studio, theater, cinema, office or other place that need to reduce noise and prevent fire. Easy to use, just put them between walls and ceilings, mounting them horizontally is also a good idea. Exquisite workmanship, unique bass traps design, lightweight and sturdy, this is a nice choice for you. Specifications： Color: Black Material: Foam Product Size: 48 * 12 * 12cm/ 18.8 * 4.7 * 4.7inch Product Weight: 50g/ 1.7oz (single one) Package Size: 55 * 15 * 12cm/ 21.6 * 5.9 * 4.7inch (single one) Package Weight: 200g/ 7.05oz Package List： 4 * Acoustic Foam Panel Note: The product is shipped after compression, and it takes some time to recover rebound before use. Package List: 4 * Acoustic Foam Panel Note: The product is shipped after compression, and it takes some time to recover rebound before use.