These nocks light up with the shot by a switch activated by the string to give a bright red light to make them easier to see, to switch them off there is a switch on the side so there are no tools needed Max lite time 48 hours, pack of 3 Will fit any arrow with .245-.246" or 6.2 internal diameters like Bearpaw Traditional Extreme & Stick Shooter Supplies Carbonwood Arrows Gold tip, Carbon Express etc.

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