... 2.soft surface 3.high efficient noise insulation wave sound absorbing sponge effect is good, function FR,Rohs,svhc Uses ... featureSound-absorbing effect is good, functionFR,Rohs,svhcUsesNoise reductionIndustry StandardGB,BS-5852 or TB117MakerDaye Tengfei Sponge/foam when the sound waves ... pore walls, so that a considerable part of the sound energy into heat energy has been consumed. Dear friends, ...