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 GT Fits-Green Light-27.4 grains -3/packPRODUCT SPECIFICATIONS:Dimension 0.70 X 2.85 X 5.15Height 0.7000Width 2.8500Length 5.1500COLOR GREENTYPE NOCKSMECHANICAL NFIXED NGRAIN 27DIAMETER FITS ARROWS WITH ID OF .246"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 GOLD TIP PRO HUNTER,XT HUNTER,EXPEDITION HUNTER, REDHEAD BLACKOUT X5,X3,X1, VELOCITY PRO,XT & HUNTER SERIES,TED NUGENT SIGNATURE