To replace existing ARCs on FAST Carbon and Bump Helmets. -Quick and easy replacement. -Same durable, lightweight design as original ARCs. -When properly installed, provides all the same benefits as original ARCs including: streamlined mounting of accessories --multiple non-snag attachment points for quick, easy and secure donning and doffing of accessories and better routing of external wires and cables in a streamlined configuration to minimize user distraction --compatibility with ballistic visors and mandibles for fully integrated face protection --emergency releases accessories at 8ft-lbs (11 Newton meters) of torque to prevent neck injuries in the event of snagging -Replacement Kit includes: two FAST Carbon or Bump ARCs, and mounting hardware (22mm ballistic screws); bungees are not included.