Us hearing protection ed 1, to helmet product description passive hearing protection to mounting on helmet adjustable attenuation value high 27 db attenuation value medium 23 db attenuation value low 16 db sid 25 model no.. Ed 1 c match on helmets with standardslids no conductive parts 250 g hygiene kits ed 99400 us no.. 2508 En352-3:2002 paragraph 1 20
