Lumenok Lighted Arrow Nock Gt-Series Green. The patented Lumenok activates by the force applied to it upon release of the arrow and deactivates by slightly pulling the nock back as to break the contact. Lumenok Lighted Nocks have helped millions of shooters see blood trails make blood trails drop a blood trail find their fallen arrows and much more. The Lumenok Lighted Nock is activated by the force applied to it upon release of the arrow which is the same as a firer in a gun. Once the arrow passes the nock the light stays on until it goes out or until it wears down from use. Try out the new Lumenok GT Lighted Nocks in hunter green for an added boost of lighting on your hunts. Specifications for Lumenok Lighted Arrow Nock Gt-series Green 3pk: Color: Green Mechanical: N Fixed: N Grain: 27 Diameter: Fits arrows with id of .246" Other features: Simple preperation of arrow shaft prior to installation will insure trouble free operationaids in tuningstays lit up to 40 hours Other features2: Fits gold tip pro hunterxt hunterexpedition hunter redhead blackout x5x3x1 velocity proxt & hunter seriested nugent signature Features of Lumenok Lighted Arrow Nock Gt-series Green 3pk: Weighs 27.4 grains Replaceable Battery - The patented Polymeric battery holder allows for battery replacement and protection against failure due to hard impacts The Lumenok is a lighted arrow nock used for shot placement recognition & arrow retrieval. Lumenok GT lighted arrow nock fits .246" ID carbon and aluminum shafts. Each Lumenok is equipped with a replaceable battery (Lumenok part # RB). Lumenok GT Fits Gold Tip: Hunter Series Velocity Series Bass Pro: Blackout Envy NOTE: Lumenoks work best with all carbon shafts Performance with carbon wrapped shafts is marginal. Package Contents: Lumenok Lighted Arrow Nock Gt-series Green 3pk The Lumenok Lighted Arrow Nock Gt-series Green 3pk is a quality addition to the Lumenok lineup. For more great deals on Arrow Nocks and Inserts by Lumenok please browse our Lumenok Archery Equipment page. Lighted nock that is activated by the force applied to it upon the release of the arrow and deactivated by slightly pulling it back as to break the contact. Designed to aid in watching your arrow flight and recovery of you game. Five sizes to fit most carbon and aluminum shafts.