Scan Tapered Foam Earplugs made from soft energy absorbing polymer foam, which compresses and then expands for a perfect fit in the ear canal. Reduces sound levels to the ear drum while maintaining aural contact. 6 pairs supplied in 3 re-sealable containers, each with 2 pairs of earplugs. Conforms to EN352-2:2002. SNR = 37dB (Single Number Rating (SNR) = the number of decibels reduced by the product).