Don't just picture the perfect shot, actually see it with the Easton Tracer Nocks. The dependable magnetic trigger turns them on at the shot and the 90 hour battery life keeps them lit until you find them. Match weight practice nocks are included with each pack for confident practicing. The easy adhesive Free installation ensures consisten nock position without moving or turning. Ultra bright LED has either flash mode or permanent on/off capability. Net weight gain over existing Easton Nocks is 13 grains.