Check the listing for details. 6/12Pc Automatic LED Shooting Archery Arrows Lighted Nocks 6.2mm Arrow Nock Tail. Condition: New. Listed at 16.39 USD. 6/12Pc Automatic LED Shooting Archery Arrows Lighted Nocks 6.2mm Arrow Nock Tail Product Features LED Archery Arrows Lighted Nocks. Diameter: 6.20mm/7.62mm. Perfect for compound recurve long bow. Provide three available colors for your choice: Green/Blue/Red/Yellow/Multi color. Battery Life: The battery can be used for 48 hours. Suitable for hunting or shooting in the dusk night, easily to track in the other day. How to Use: This nock does not need to be lit in advance, the string is automatically lit at the moment of shooting.; Push up when you turn off. Weight: Total 20 g, lightweight. Product Specification Type LED Arrows Nocks Weight Total 20 grain Available Colors Five colors Diameter 6.20mm/7.62mm（Optional） Package Included 6/12/18/24pcs LED Arrows Nocks (Color as your choice)