Lumenok lighted nock xbow hd orange crescent easton 3pk FEATURES-Activated upon the shot & relies upon the conductivity of the shaft-No switches or magnets required-Designed to be used over and over to allow archers to follow the pathc of their arrows-Provides up to 40 hours of illumination-Fits Easton/Beman carbon crossbow bolts-3/pack-Orange Other Features: Simple preperation of arrow shaft prior to installation will insure trouble free operation.Aids in tuning,stays lit up to 40 hours fits:easton powerbolt,beman thunder bolt & tenpoint pro- elite