Scan Tapered Foam Ear Plugs – 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. SNR = 33dB (Single Number Rating (SNR) =the number of decibels reduced by the product). – Easy insertion and removal. – 6 pairs in 3 re-sealable containers each with 2 pairs of ear plugsa. – Conforms to EN352-2:2002.