Built for visibility and durability, the Flex Fletch LIT Lighted Nocks for .204 ID carbon shafts ensure reliable tracking in low-light conditions. This 3-pack of blue lighted nocks features an external on/off switch for hassle-free operation, an auto-on design that activates upon arrow release, and a battery life of up to 48 hours. Weighing just 18 grains, these cost-effective nocks are engineered to help preserve your arrows while offering standout performance.