Nockturnal’s Lighted S-Nocks offer outstanding reliability in the worst possible conditions. They provide a vital indication of where your arrow hit the animal, and also aid in locating your arrow if you miss. The S-Nocks are bowstring activated to keep operation simple and intuitive, and are both water and weather proof. Available in red or green, the S-Nocks have an extended runtime of 20+ hours and fit standard diameter carbon .244 ID shafts. 3 nocks per pack. Features: Bowstring activated linear switchFool proof operation in any conditionLong life lithium batterySuper bright LEDsWater and weather proofUnsurpassed reliabilityAvailable in Red or GreenFits standard carbon .244 ID shaftsEach nock in this package weighs approximately 25 grains3 lighted nocks per pack Nockturnal S Green Nock 3pk NT-205