These AO Safety ear plugs feature a dual end design. Green end offers constant protection against noise (NRR 22dB). Yellow end lets wearer hear clearly with instant protection against sudden loud noises. U.S.A. Hearing Protector Type: Earplugs, Noise Reduction Rating (NRR) (dB): 22, Pairs (qty.): 1 Thermoplastic elastomer material Tapered triple flange Meets ANSI S3, 19-1974 standards
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