The 3M E-A-R Tracer 20 earplug is a low attenuating metal detectable corded ear plug, is ideal for use in the food manufacturing industry or where contamination needs to be considered. Contains a non-ferrous filter and has a fully metallised detectable cord in non-food blue. Moisture resistant, reusable and comes with a cord. Attenuation: SNR = 20dB, High Frequency = 25dB, Medium Frequency = 17dB, Low Frequency = 10dB.