If you don’t get calm! 50 pairs of Bilsom 303 S, for two in a poly bag, highlights and details, SNR value 33 dB for wide (L) ear canals, features: insulating strong ear plugs made from harmless polyurethane foam, shaped before use, conically shaped optimal fit in the ear canal, hygienic, smooth surface, size 303 L for wide ear canals. Technical data standards EN 352-2 SNR value 33 dB.