Easy to install and easy to use, Nocturnals Launchpad Universal Lighted Crossbow Nocks make it easier to see your shot and find your arrow in any light. Designed for higher arrow speeds, these nocks feature a tough, 1-piece aluminum housing to protect the nocks battery and LED during high-speed flight and impact. Designed to fit nearly all crossbolt brands and models, these nocks feature a custom-fit, micro-adjustable barrel end for a reliable performance fit. Nocks also come with a second gray collet to fit a wider range of arrows. Helping crossbow hunters see arrow impacts under any light and find arrows on pass-through shots, these ultra-strong nocks feature Nockturnals game-changing, shot-activated lighting system for a foolproof glow to help you retrieve your arrows. Easy and reliable, the indexed nock end provides added safety and an easy on/off design. Nocks come with a reusable c-clip to prevent lighting during storage. Made in USA. Colors: Red, Green (not shown). Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Crossbow Nocks.