3M Peltor‚Ñ¢ Electrically Insulated Earmuffs, Cap Mount, 24 NRR dBAppropriate for a wide range of applications Earmuff cups are made of non conductive material while the metal components of the headbands and the helmet attachment mechanisms are covered in non conductive material High performance arms; balance durability and flexibility Easy click in click out: Move cups on and off ears easily Store with cups clicked in or out Compatibility with hard hats; designed for use with a standard hard hat slot Fit can be