Nockturnal lighted nocks are a breakthrough design that combines ultra-light performance with a high visibility light source and "instant on" simplicity that activates upon release.  The patent-pending string-activated "hidden linear switch" is protected deep within the nock and will not turn on or off inadvertently.  Battery life is over 20 hours.

-Will fit inside diameter of .26" through .314"

-Flat nock

-High Visibility LED

-Bowstring activated on-off switch

-No assembly required