1、With a density of 200kg/m3 - This soundproofing soundproof 2 - 5x better than “in-the-market products" Such as - Acoustic Foam/ Foam Panels / Acoustic Panels / Wall Panels / Insulation Foam / Sound proof Padding / Mass Loaded Vinyl. 2、These panels pack a punch for your sound proof needs! 3、Great for removing bad interior acoustics like echoes and reverbs! 4、These panels are 100% Safe - No more Melamine Foam indoors, these panels are manufactured in clean room with 100% Fibres, No Chemical Added.  5、Not even fire retardant agents when award Class B1 Fire Retardant. 1 set of 6 sound absorbing panels Material: Polyester fiber Color: Black / Gray Size: 30 * 30 * 0.9cm / piece Treatment: Beveled Performance: Sound absorption, silence, decoration Applicable Scene: Kindergarten / Restaurant, ktv / drum room, recording room Product Use: Theatre lecture hall, interrogation room / hotel / lobby, etc. Need sound absorption decoration place