Led Lighted Nocks for Arrows with 0.244 Inside Diameter Features High Visibility:An essiential tool for archery hunting Inside Dia: .244 Inch Batterie:Lithium batterie, replaceable Long batterie life: 48 hours Avaible Colours:Red/Green/Blue/Yellow/colorful(Flashed with 7 colors) Package Contents 6 Lighted Nocks1Screwdriver..