3M™ Earplugs 1100 Series Corded - 500 PairsKey Features SNR 35 dB Higher L value of HML data, provides better attenuation at low frequencies (< 500Hz) Slow recovery foam helps make the insertion easier Soft pliable foam conforms to the shape of your ear canal for better comfort and all day wearability Designed with Tapered shape Compatible with the 3M E A Rfit Dual Ear Validation System What's in the box 3M Earplugs 1100 Series Corded (500 Pairs)