Helmet mounting lightweight earmuffs. Easy-to-use adaptersystem allows attachmentt to allmost common work safety helmets on the market. Certified for example with all Petzl work helmets. Delivered together with Petzl compatible 733N II helmet adapters (similarto P3E). Suitable for multi-purpose general use. Compact and durable structure. Soft seals replaceable. CE EN 352-3. SNR 29 dB. NRR 22 dB. SLC80 28 dB. Weight240 g. Manufactured in Finland.