... .soft surface 3.high efficient noise insulation wave sound proof sponge effect is good, function FR,Rohs,svhc Uses Noise reduction ... , functionFR,Rohs,svhcUsesNoise reductionIndustry StandardGB,BS-5852 or TB117MakerDaye Tengfei Sponge/foamwhen the sound waves incident into it, it can cause ... DetailsUses and product color and packaging requirements wave sound proof sponge