sound absorbing panels weighs more than 4 pounds, high-density pads of more than 230kg / for noise deadening, dampening, acoustic isolation, reducing, reverb diffuser, acoustic treatment, other sound absorption and SGS TEST:In the frequency of 2000 Hz ~ 5000 Hz, average absorption coefficient: 0.8, : 0.9 (SGS NO. XMIN190100254CCM), Properly installing a sufficient number of panels in one space can significantly reduce noise, eliminate sound impurities and speech intelligibility, each panel is SGS environmental protection test, Formaldehyde free: E0 Class (SGS NO. SHAEC1709892601); Fire-safe: B1 Class (SGS NO. XMIN190100052CCM ) No ToxicAPPLICABLE:Professional acoustic control / treatments, sound dampening, noise reduction ( Neighbor Call / Snore / Piano / Footstep / Talking / TV / Car horn sound etc. ) - Used for ceiling, main wall, TV wall, door, window; Offices, apartment, home theaters, studios, school, stage, rehearsal rooms, concert , podcasting, churches, dog kennelsEASY TO INSTALL: So light tiles, that you can place on your walls with double-sided ( Need to buy ) tape, not damage the paintSTABLE PROPERTIES: plates will not expand and shrink due to temperature or humidity.Type: Acoustic Soundproof FoamHome/Cinema - Enjoy your favorite with enhanced sound experience provided by isolation echoes and reverb from bouncing off adjacent walls, voices of a bus, or one night conversations about night, or Footsteps from the ceilingStudio Room - Isolate, , and disperse excess sound allowing the music you're making to be beautifully unaffectedOffice - reduce excess noise from your work space, important meetings are not affectedcolour:WhiteMaterial:Polyurethanesize:30cm x 30cm x 9mmPackage Contents:5 xAcoustic Foam PanelsOnly the above package content, other products are not included.Note: Light 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.