Rage Legacy shock collars help prevent the blades on your Rage broadhead from prematurely deploying if you accidentally bump your broadhead while on stand or stalking. Legacy Shock Collars fit any 100 grain Rage Broadhead and are designed to be used in conjunction with the O-ring for optimal blade retention. Legacy shock collars break on impact, so they will need to be replaced after every shot. Inspect the legacy shock collar prior to use to ensure proper function. Legacy shock collar use is optional. Approximate quantity is 15-20 per container.