The fear of hypodermic needles is called Trypanophobia, and the Hypodermic Trypan is the scariest broadhead design Rage has ever produced! These shock collars are specifically designed for the Hypodermic Trypan Crossbow broadheads. They give you reliable blade retention and break away on impact to ensure full blade deployment. When you introduce the Rage Hypodermic Trypan into your hunting grounds, every deer in those woods will develop Trypanophobia!