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 with the benefit of attached cords to avoid dropping or loss and are visible in use. 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 plugs.- Conforms to EN352-2:2002.