Clean-Shot Out Lighted Nock Universal Fit:Perfect gift for the archers! Dont worry about buying the right size of lighted nocks - there is only ONE package. We include precision bushings to fit the 5 most common (G, X, H, S & GT) carbon arrow shafts. Practice Mode: The only lighted nock that can be turned off! A simple turn of the silver activation collar deactivates the LED for traveling, 3D tournaments or lightless practice - preserves battery. Confidence: Practice and hunt with the same arrow configuration for improved confidence. Easy Off: The easiest lighted nock to turn off! With the arrow still in the target, simply pull the nock straight back until you hear a soft "click" and the LED turns off - no tools are required. Weight: 21 - 24 Grains (depends on bushing size); Battery: 24 hours (continuous on time). Battery is disposable.