The 3M E-A-R Soft FX ear plug is the highest protecting earplug in their range today (SNR 39). With its smooth tapered finish, the 3M E-A-R E-A-RSoft FX earplug makes fitting easier and helps form a comfortable fit. The flange shape, when rolled down, serves as a very effective insertion device which makes the earplug very easy to fit.Attenuation:SNR=39dB, H=39dB, M=36dB, L=34dB