Rage SHOCK COLLAR™ technology prevents the blades on your Rage broadheads from prematurely deploying if you happen to bump your arrow or broadhead while on stand or stalking. SHOCK COLLAR™ are designed to break upon impact and will need to be replaced after each shot. Blades should rest on the solid portion of the SHOCK COLLAR™, not in the cuts. Inspect the SHOCK COLLAR™for any damage prior to use to ensure proper function. Approximate quantity is 15-20 per container.