The Nockturnal Launchpad Strobing Red/Green Crossbow Nock 3pk NT-780 is designed to provide maximum visibility and performance for crossbow hunters. These lighted nocks feature a strobing red and green LED that alternates colors, making it easy to track your bolt's flight path in low-light conditions. The adjustable barrel end ensures a custom fit for virtually any crossbow bolt, while the durable, impact-resistant construction guarantees long-lasting use. With a battery life of over 20 hours, the Nockturnal Launchpad Strobing Red/Green Crossbow Nock is an essential accessory for any serious crossbow hunter. Nockturnal Launchpad Strobing Red/Green Crossbow Nock 3pk NT-780