Mega T Fit™ Corded Disposable Ear Plugs, Soft Polyurethane Foam, 100 Pairs (267 HPF510CC) NRR 32 Length_12" Features a super lightweight Polycarbonate ABS Features a super lightweight Polycarbonate ABS shell and a integrated hi density inner shell foam liner that work in conjunction with the highly adjustable 4 point nylon inner suspension to provide exceptional protection from top of head and lateral impact hazards Dynamic™ Wire Cable Self Retracting Lifeline (SRL) 10m 32ft FP2AA10C is closely approximated by the difference between the A weighted environmental level and the NRR The level of noise entering the ear is approximately equal to 60 dB(A)