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noise reduction foam 1.feature Sound-absorbing effect is good, 2.function FR,Rohs,svhc 3.Uses Noise reduction absorb a large number of incoming acoustic energy of the acoustic attenuation, reducing the interference and echo sound reflections ,improve the purity of the sound1.feature Sound-absorbing effect is good, 2.function FR,Rohs,svhc3.Uses Noise reduction4.Industry Standard GB,BS-5852 or TB1175.Maker Daye Tengfei Sponge/foam
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