Lumenok lighted nock signature series green 3pk FEATURES:-Activated upon the shot to allow archers to follow the path of their arrow-Provides up to 40 hours of illumination & can be seen from great distances-No magnet required for activation-Replaceable battery-Lumenok Signature Fits-Green Light-27.4 grains -3/pack 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 beman-ics.Cabelas-stalker extreme,& carbon hunter.Carbon express-mayhem,blue streak, piledriver.Carbon impact-titan ,stealth & hunter xlt