The Legacy 100 Gr. Shock Collar by Rage prevents the blade on any of your 100 Gr. Rage broadheads from prematurely deploying. Designed to be combined with the Range O-ring for optimal blade retention. If you happen to bump your arrow or broadhead while on a stand or stalking, the Extreme Shock Collar keeps the blade secure and steady. Shock collars are designed to break upon impact so will need to be replaced after each shot. Inspect for any damage prior to use to ensure proper function. Comes in a package with 15 collars.