Hi All:
I just got in a few of the Easton Tracer nocks to play arround with. I got the flat nocks. Anyway, the website has no details, so I figured I would pass along what I found. The nocks themselves are pretty cool, and require no glue and sit flush in the end of the shaft with no problems (gotta find out what you are supposed to do with moon nocks if you cant glue them...) They weigh 26.2gr compared to an aluminum nock at 32.4gr. they are switched on and off by passing them past a magnet that you glue to your crossbow within 1" of where the nock can pass it (clearance on the front of some bows with broadheads may be close, so check it) the magnet is pretty small (watch battery size) so location should not be too hard. One of their "suggested locations" is on the bolt clip. Not sure about that one...I think on the riser would be better. They come in a "sleep mode" to save the battery. You can take it out of and put it into sleep mode by holding it next to the magnet. Once shot, it passes by the magnet and turns on. After about 30 seconds it flashes. That is pretty cool!. Anyway, it supposedly lasts for 90 hours of this, and since you dont glue them in, changing them out is pretty easy. Overall...I am pretty impressed. They are sold as singles, 2 packs and 4 packs....

Wyvern