Unverified50% confidenceFactTime unknown
泡棉（PU/记忆棉）耳塞NRR普遍在29-33dB，是被动降噪最高的材质，适合工厂、射击等高噪环境；硅胶耳塞NRR多在22-27dB，隔音较弱但可反复清洗
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