New lighted nocks out that fit all standerd carbon arrows with internal diameter of .245-.246, Bearpaw Traditional extreme etc,Goldtip,Carbon Express,Eastern etc. Can stay lite for 48 hours continuously.
Light is activated by the bow string when shot using a micro switch in the valley of the nock. To turn off there is a slide switch on the side, easily done no mucking around with tools or knife. price for a packet of 3