... , function FR,Rohs,svhc Uses Noise reduction Industry Standard GB,BS-5852 or TB117 Purpose regionalPublic places, production equipment and many other areasMaterialCan ... featureSound-absorbing effect is good, functionFR,Rohs,svhcUsesNoise reductionIndustry StandardGB,BS-5852 or TB117MakerDaye Tengfei Sponge/foamwhen the sound waves incident into ...