If you do not receive a rest. 50 pairs of Bilsom 303 L as a couple in a polybag, highlights & details SNR value 33 dB for long (L) ear passages Features Insulation arker ear plugs made from health harmless polyurethane foam to mould conical shaped optimal fit in the ear canal before use Hygienic smooth surface Size 303 L for long ear passages. Technical Data Meets EN 352-2 SNR value 33 dB dB