The Lumenok lighted arrow nock is activated upon the shot allowing you to follow the path of your arrow. Provides up to 40 hours of illumination and can be seen from great distances. No magnets required for activation. Made using a genuine Burt Coyote nock. Fits .246" ID Shafts Directly. If your arrows have bushings from the factory, those will have to be removed. Fits .246" shafts 22-grain weight Provides up to 40 hours of illumination Runs on replaceable battery 3 Pack Order today!