Lumenok Lighted Arrow Nock X-Series Red. This Lighted Nock by Lumenok is activated by the force applied to it upon release of the arrow and deactivated by slightly pulling it back as to break the contact. It's equipped with an extremely bright LED light that is activated by the kinetic energy of the arrow as it passes through the nock. Each Lumenok X is equipped with a replaceable (Lumenok part # RB) battery that will fit most carbon and aluminum shafts. So if you're looking for some assist with your sighting and retention then do not hesitate to get these Lumenok Lighted X-Series Arrow Nocks. Specifications for Lumenok Lighted Arrow Nock X-Series Red: Manufacturer: Lumenok Color: Red Quantity: 3 Pack Additional Features: X Series Weight: 1.55517 g Diameter: 0.204 in Features of Lumenok Lighted Arrow Nock X-series Red 3pk: Weighs 24.5 Grains Extremely Bright The Lumenok is a lighted arrow nock used for shot placement recognition & arrow retrieval. Lumenok X lighted arrow nock fits .204" ID carbon and aluminum shafts. Each Lumenok is equipped with a replaceable battery (Lumenok part # RB). Lumenok X Fits Easton: Axis Traditional Only AC Superslim Beman: MFX Nightfall Gold Tip: Kinetic Black Eagle: Rampage Victory: RIP Package Contents: Lumenok Lighted Arrow Nock X-series Red 3pk The Lumenok Lighted Arrow Nock X-series Red 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.