The Nockturnal Shift Universal Green Lighted Nock 3pk NT-831 offers archers enhanced visibility and reliability with its ultra-bright green LED illumination. These lighted nocks feature a patented, string-activated, piston-driven contact linear switch that triggers the LED upon release, ensuring you can easily track your arrow's flight path. The external on/off switch allows for quick deactivation, while the durable polycarbonate construction provides impact resistance. Compatible with X, H, S, and GT arrows, these nocks deliver over 20 hours of battery life, making them perfect for low-light conditions and ensuring you never lose sight of your shot. Nockturnal Shift Universal Green Lighted Nock 3pk NT-831