Nockturnal is a leading designer and manufacturer of lighted nocks for arrows and crossbow bolts. Nockturnal?s unique patented string-activated linear switch with piston-driven assembly ensures activation of the LED bulb every time. Nockturnal lighted nocks feature super-bright LEDs and long-life lithium batteries for superior illumination that lasts. Available in a wide variety of sizes and configurations that fit nearly any size arrow or shaft these specialty nocks perform with exceptional accuracy when shot from both vertical and crossbows. Nockturnal lighted nocks blaze down range with extreme brilliance with a wide spectrum of color options and offered as either constant single-color light emission or with dual-color strobing options on select models.