Carbon Express Launchpad Precision Lighted Bolt Nock -
Easily track the flight of your crossbow bolt with the Launchpad lighted half-moon nock. Its ultrabright LED instantly lights up upon firing. Integrated aluminum housing protects the long-life battery and LED. Reuseable spacer tab prevents inadvertent lighting in the field or while traveling. Not for use with aluminum bolts. Easy on and off indexed design. Per 3.