The Grip Design Eliminates The Need To Touch The Plug's Pod Which In Turn Eliminates The Chance Of Contamination. The Soft Foam Pods Have A Slow Recovery Time Offering A Customized And Secure Fit Every Time. Designed Not To Shift Or Dislodge With Jaw Movement. Ansi S3.19 1974/csa Z94.2., Nrr 25 Db Uom 100 Pr/box. (NRR 25dB, Eliminates the fear of hand-to-ear contamination, Soft flexible grips for easy insertion and removal, Slow recovery foam inserts easily, seats and stays in place, Designed for excellent attenuation on the job.)