The Easton Lighted Tracer Nocks now utilize Easton technology to create a more advanced lighted nock system. Lightweight Tracer features a 90-hour battery life, a microchip controlled flash mode, and permanent on/off capability. Easy, adhesive-free installation. Ultra-bright LED illumination. Dependable magnetic trigger—automatically lights every shot. Made with genuine Easton nocks. Match weight practice nocks included with two and four packs!