27NRR Blackhawk Over-the-Head Earmuffs 5" Safety Active ingredient: Calcium Carbonate 420

Active ingredient: Calcium Carbonate 420 mg chewable tablets

Auto battery life over 30

Relief Against Organic Vapors & Ozone Protection up to 10 times OSHA PEL

Set on a heavy duty oil- and slip-resisting rubber outsole

Each component is produced to exact specifications and verified by a strict quality control process

27NRR Blackhawk Over-the-Head Earmuffs 5" Safety Active ingredient: Calcium Carbonate 420High performing, dielectric earmuff. Three position model allows for user adjustment. Specialized, high density foam head pad and Soft Seal ear cushions. Independently tested to a 27 NRR (over the head). Product Overview Blackhawk 27NRR Over the Head Earmuffs High performing, dielectric earmuff Three position model allows for user adjustment Specialized, high density foam head pad and Soft Seal ear cushions Independently tested to a 27 NRR (over the