... acoustic absorptivity>0.9 .2. Better effect for low ,middle.and high noise .3. fireproofing,no sands pollution ,strong decorative ... deposit (total of 30% to 50%), we will design drawings and sent you by e-mail, if ... assured) The soft bag crystal buttons, crystal buttons New design:There are four colors of mosaic glass for option ... win-win cooperation. Acoustic foam materials,new design sound proof