Nockturnal Green Lighted S Nocks Model# NT-205 are designed with an exclusive patented linear switch for foolproof operation in any condition. Featuring bright LEDs powered by a long-lasting lithium battery, these nocks are reliable and water-proof, ensuring visibility in low-light situations. Each nock weighs approximately 25 grains and fits standard carbon shafts, making them a must-have for archers who want to track their shots with ease.