Earmor ARC Helmet Rails Adapter Attachment Kit Tactical Black. Compatible most of the headsets on the markets. Specifications for Earmor ARC Helmet Rails Adapter Attachment Kit: Manufacturer: Earmor Color: Tactical Black Package Contents: Earmor ARC Helmet Rails Adapter Attachment Kit Left & Right Side Earmor M11: ARC Helmet Rails Adapter Attachment Kit Tactical Black