1 pcs 6.2mm Lighted Nocks LED Lighted Arrow Nock For Hunting Shooting Recurve Bow Crossbow Compound Bow Fits most arrow shafts with inside diameter 6.2mm. Up to 24 hours of battery life You can turn on or turn off the light by pushing or pulling the LED stick. It's very easy to use! Weight:20 grain Package include: 1pcs x light nocks