Extreme Shock End Caps
Due to the design of the EZ-Coil, Extreme Shock End Caps (ESEC), which were once optional, are now required in all Firenock lighted nock systems. Today, all styles come with ESECs and ESEC installation tools. Extreme Shock End Caps, after years of testing, have proven again and again that they are truly the best insurance policy you can have for both normal and crossbow arrows for any speed or terms. They are what makes Firenock durable enough to "remain lit after hitting hard objects (e.g. bone, stone, or concrrete) or after game moves vigorously."