Reusable Uncorded Ear Plugs, Flanged Shape, 32 dB, 120 Pairs, SilverMfr #: P1300 Secure: Exposed cell surface texture resists movement and helps maintain an effective seal creating a comfortable, snug noise barrier. Noise Reduction Rating (NRR) 29 dB. CSA Class AL. Outstanding comfort: This unique slow recovery, low pressure foam and special cylindrical shape help enhance comfort throughout the day by creating lower pressure in the ear canal. Soft sound absorbing foam: Proprietary foam is initially firm to make