Rage SHOCK COLLAR(TM) 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(TM) 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(TM) not in the cuts. Inspect the SHOCK COLLAR(TM)for any damage prior to use to ensure proper function. Approximate quantity is 15-20 per container.Features: Available for all Rage Broadheads utilizing SHOCK COLLAR(TM) Technology Reliable blade retention Breaks upon impact to allow full blade deployment Standard and High Energy SHOCK COLLAR(TM) for Vertical and Crossbows 15-20 per pack